| Portsmouth Rhode Island Weather Almanac |
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| Saturday,
September 18, 2021 |
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| Cloudy &
Fog early, Mostly Cloudy Day to Partly Cloudy PM, Continued Warm and Humid |
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Climate
Normal Period |
Climate Record Period |
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1991 -
2020 |
1893 - 2021 |
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September 18, 2021 |
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Record |
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Record |
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| Observed Daily Data |
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2021 |
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2020 |
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Norm |
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Depart |
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Highest |
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Lowest |
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| Maximum Temperature |
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74 |
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67 |
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71 |
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+3 |
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84 |
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in |
1914 |
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58 |
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in |
1996 |
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| Minimum
Temperature |
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64 |
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54 |
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57 |
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+7 |
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68 |
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in |
2016 |
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41 |
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in |
1990 |
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| Average Temperature |
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69 |
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61 |
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64 |
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+5 |
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74 |
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in |
2016 |
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52 |
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in |
1990 |
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| Month Avg Max Temperature |
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75.8 |
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76.1 |
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73.9 |
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+1.8 |
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80.9 |
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in |
1983 |
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68.4 |
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in |
1917 |
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| Month Avg
Min Temperature |
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61.9 |
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59.7 |
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59.1 |
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+2.8 |
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64.6 |
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in |
1915 |
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52.8 |
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in |
1975 |
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| Month Average
Temperature |
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69.2 |
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68.2 |
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66.5 |
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+2.7 |
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72.4 |
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in |
1961 |
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61.4 |
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in |
1963 |
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| High
Heat Index |
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70 |
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66 |
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72 |
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-2 |
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89 |
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in |
1992 |
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| Low Wind Chill |
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36 |
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in |
1990 |
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| HDD |
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0 |
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4 |
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3 |
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-3 |
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13 |
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in |
1990 |
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0 |
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in |
2021 |
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| Month HDD |
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1 |
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16 |
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26 |
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-25 |
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85 |
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in |
1913 |
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0 |
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in |
2015 |
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| Season HDD |
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10 |
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16 |
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33 |
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-23 |
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97 |
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in |
1913 |
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0 |
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in |
2015 |
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| CDD |
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4 |
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0 |
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2 |
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+2 |
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9 |
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in |
2016 |
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0 |
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in |
2020 |
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| Month CDD |
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76 |
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74 |
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53 |
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+23 |
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148 |
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in |
1961 |
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7 |
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in |
1975 |
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| Year CDD |
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759 |
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840 |
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590 |
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+169 |
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840 |
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in |
2020 |
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280 |
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in |
1902 |
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| Maximum Dew Point |
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68 |
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63 |
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62 |
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+6 |
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73 |
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in |
2018 |
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41 |
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in |
1990 |
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| Minimum
Dew Point |
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62 |
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38 |
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52 |
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+10 |
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67 |
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in |
2018 |
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32 |
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in |
1959 |
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| Average Dew Point |
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65 |
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51 |
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57 |
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+8 |
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70 |
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in |
2018 |
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37 |
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in |
1990 |
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| Month Avg Max Dew Point |
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67.3 |
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65.8 |
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64.1 |
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+3.3 |
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69.2 |
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in |
2018 |
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55.2 |
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in |
1975 |
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| Month Avg
Min Dew Point |
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58.2 |
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53.8 |
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54.6 |
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+3.6 |
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61.3 |
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in |
2018 |
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44.4 |
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in |
1984 |
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| Month Average Dew Point |
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63.0 |
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60.0 |
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59.3 |
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+3.7 |
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65.5 |
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in |
2018 |
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49.9 |
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in |
1984 |
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| Precipitation |
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.00 |
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.00 |
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.14 |
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-.14 |
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2.85 |
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in |
1936 |
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| One Hour |
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.00 |
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.00 |
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.69 |
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in |
2004 |
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| Hourly Rate |
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.00 |
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.00 |
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3.49 |
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in |
2018 |
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| Month Precipitation |
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8.56 |
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.66 |
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2.19 |
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+6.37 |
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8.56 |
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in |
2021 |
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.06 |
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in |
1946 |
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| Year Precipitation |
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37.66 |
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24.69 |
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31.47 |
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+6.19 |
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46.35 |
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in |
1998 |
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17.53 |
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in |
1957 |
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| Snow |
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#N/A |
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#N/A |
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#N/A |
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#N/A |
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#N/A |
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in |
#N/A |
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| Snow Depth |
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#N/A |
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#N/A |
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#N/A |
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in |
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| Month Snow |
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#N/A |
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#N/A |
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#N/A |
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#N/A |
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#N/A |
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in |
#N/A |
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#N/A |
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in |
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| Season Snow |
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#N/A |
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#N/A |
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#N/A |
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#N/A |
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#N/A |
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in |
#N/A |
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#N/A |
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in |
#N/A |
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September
18, 2021 |
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|
Record |
Record |
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| Observed Daily Data |
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2021 |
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2020 |
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Norm |
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Depart |
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Highest |
Lowest |
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| Maximum Humidity |
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99% |
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95% |
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94% |
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+5% |
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100% |
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in |
2018 |
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78% |
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in |
1968 |
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| Minimum
Humidity |
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80% |
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53% |
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61% |
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+19% |
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96% |
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in |
1993 |
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35% |
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in |
1968 |
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| Average Humidity |
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90% |
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74% |
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77% |
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+12% |
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98% |
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in |
1993 |
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57% |
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in |
1968 |
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| Maximum Barometer |
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30.12 |
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30.09 |
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30.14 |
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-00.02 |
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30.65 |
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in |
1947 |
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29.66 |
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in |
1996 |
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| Minimum
Barometer |
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29.95 |
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29.91 |
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29.93 |
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+00.02 |
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30.39 |
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in |
1985 |
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29.38 |
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in |
1996 |
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| Average Barometer |
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30.04 |
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30.00 |
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30.03 |
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+00.00 |
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30.42 |
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in |
2011 |
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29.52 |
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in |
1996 |
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| Average Wind |
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5.6 |
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9.1 |
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6.0 |
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-0.4 |
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12.6 |
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in |
2004 |
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1.2 |
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in |
2001 |
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| Direction |
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NNE |
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NNE |
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NNE |
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N |
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NW |
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| High Wind Gust |
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18 |
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28 |
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21 |
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-3 |
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38 |
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in |
2004 |
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10 |
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in |
1951 |
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| Direction |
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NNE |
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NNE |
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NE |
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N |
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SW |
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| Maximum Water Temp |
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70.9 |
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68.7 |
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68.0 |
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+2.9 |
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71.2 |
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in |
2015 |
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64.0 |
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in |
1996 |
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| Minimum
Water Temp |
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69.5 |
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66.7 |
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66.0 |
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+3.5 |
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69.6 |
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in |
2018 |
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62.6 |
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in |
2013 |
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| Average Water Temp |
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70.2 |
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67.7 |
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67.1 |
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+3.1 |
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70.3 |
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in |
2018 |
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63.5 |
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in |
1996 |
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| Sunrise/ AM Twilight |
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6:27:43 AM |
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6:01:26 AM |
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| Sunset /
PM Twilight |
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6:50:44 PM |
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7:17:01 PM |
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| Length Of Day |
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12:23:01 |
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| Special Conditions |
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Fog |
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| Comments |
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| Hour-by-Hour Weather For September 18, 2021 |
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| Climate Weather for September 18 |
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| Weather History For September 18 |
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| Weather Calendar |
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| Back
To Weather Stat Page |
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