| Portsmouth Rhode Island
Weather Almanac |
|
|
|
|
|
|
|
|
| Tuesday, December 15, 2020 |
|
|
|
|
|
|
|
|
| Clear to Partly Cloudy Late, Windy and Colder |
|
|
|
|
|
|
|
|
| Climate
Normal Period |
|
Climate Record Period |
|
|
|
|
|
|
|
|
|
| 1981- 2010 |
|
1893 - 2020 |
|
|
|
|
|
|
|
|
|
| |
|
December
15, 2020 |
|
|
Record |
Record |
|
|
|
|
|
|
|
|
| Observed Daily Data |
|
Observed |
|
2019 |
|
Normal |
|
Depart |
|
Highest |
Lowest |
|
|
|
|
|
|
|
|
| Maximum Temperature |
|
36 |
|
48 |
|
42 |
|
-6 |
|
61 |
|
in |
2015 |
|
24 |
|
in |
2010 |
|
|
|
|
|
|
|
|
|
| Minimum
Temperature |
|
26 |
|
33 |
|
28 |
|
-2 |
|
48 |
|
in |
2015 |
|
9 |
|
in |
1900 |
|
|
|
|
|
|
|
|
|
| Average Temperature |
|
31 |
|
41 |
|
35 |
|
-4 |
|
55 |
|
in |
2015 |
|
18 |
|
in |
1900 |
|
|
|
|
|
|
|
|
|
| Precipitation |
|
.00 |
|
.00 |
|
.14 |
|
-.14 |
|
1.79 |
|
in |
1981 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| One
Hour |
|
.00 |
|
.00 |
|
|
|
|
|
.60 |
|
in |
1987 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Snow |
|
0.0 |
|
0.0 |
|
0.2 |
|
-0.2 |
|
7.1 |
|
in |
1905 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Snow
Depth |
|
0 |
|
T |
|
|
|
|
|
11 |
|
in |
1904 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| HDD |
|
34 |
|
24 |
|
30 |
|
+4 |
|
47 |
|
in |
1900 |
|
10 |
|
in |
2015 |
|
|
|
|
|
|
|
|
|
| CDD |
|
0 |
|
0 |
|
0 |
|
+0 |
|
0 |
|
in |
|
0 |
|
in |
|
|
|
|
|
|
|
|
|
|
| Maximum Dew Point |
|
30 |
|
44 |
|
34 |
|
-4 |
|
60 |
|
in |
2015 |
|
10 |
|
in |
2010 |
|
|
|
|
|
|
|
|
|
| Minimum
Dew Point |
|
6 |
|
20 |
|
19 |
|
-13 |
|
43 |
|
in |
2008 |
|
-5 |
|
in |
2016 |
|
|
|
|
|
|
|
|
|
| Average Dew Point |
|
18 |
|
32 |
|
26 |
|
-8 |
|
50 |
|
in |
2015 |
|
4 |
|
in |
1961 |
|
|
|
|
|
|
|
|
|
| Maximum Humidity |
|
85% |
|
86% |
|
86% |
|
-1% |
|
100% |
|
in |
2018 |
|
49% |
|
in |
1961 |
|
|
|
|
|
|
|
|
|
| Minimum
Humidity |
|
31% |
|
46% |
|
57% |
|
-26% |
|
96% |
|
in |
1993 |
|
17% |
|
in |
1959 |
|
|
|
|
|
|
|
|
|
| Average Humidity |
|
58% |
|
66% |
|
71% |
|
-13% |
|
98% |
|
in |
1993 |
|
42% |
|
in |
1961 |
|
|
|
|
|
|
|
|
|
| Maximum Barometer |
|
30.38 |
|
30.08 |
|
30.14 |
|
+00.24 |
|
30.68 |
|
in |
1902 |
|
29.24 |
|
in |
1954 |
|
|
|
|
|
|
|
|
|
| Minimum
Barometer |
|
29.91 |
|
29.25 |
|
29.80 |
|
+00.11 |
|
30.46 |
|
in |
1994 |
|
29.05 |
|
in |
1968 |
|
|
|
|
|
|
|
|
|
| Average Barometer |
|
30.15 |
|
29.67 |
|
29.97 |
|
+00.18 |
|
30.51 |
|
in |
1994 |
|
29.16 |
|
in |
1954 |
|
|
|
|
|
|
|
|
|
| Average Wind |
|
10.0 |
|
12.1 |
|
8.7 |
|
+1.3 |
|
19.1 |
|
in |
1961 |
|
2.6 |
|
in |
2014 |
|
|
|
|
|
|
|
|
|
| Direction |
|
NW |
|
W |
|
WNW |
|
|
|
NNW |
|
|
|
|
WNW |
|
|
|
|
|
|
|
|
|
|
|
|
| High Wind Gust |
|
27 |
|
32 |
|
27 |
|
+0 |
|
53 |
|
in |
1953 |
|
11 |
|
in |
1992 |
|
|
|
|
|
|
|
|
|
| Direction |
|
WNW |
|
WNW |
|
WNW |
|
|
|
WSW |
|
|
|
|
WSW |
|
|
|
|
|
|
|
|
|
|
|
|
| High Heat Index |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Wind Chill |
|
21 |
|
24 |
|
18 |
|
+3 |
|
|
|
|
|
|
-4 |
|
in |
1980 |
|
|
|
|
|
|
|
|
|
| Maximum Water Temp |
|
48.9 |
|
42.3 |
|
46.1 |
|
+2.8 |
|
51.9 |
|
in |
2015 |
|
41.5 |
|
in |
1997 |
|
|
|
|
|
|
|
|
|
| Minimum
Water Temp |
|
45.5 |
|
39.9 |
|
43.5 |
|
+2.0 |
|
50.7 |
|
in |
2015 |
|
38.7 |
|
in |
2010 |
|
|
|
|
|
|
|
|
|
| Average Water Temp |
|
47.2 |
|
41.1 |
|
44.8 |
|
+2.4 |
|
51.3 |
|
in |
2015 |
|
40.1 |
|
in |
1997 |
|
|
|
|
|
|
|
|
|
| Sunrise/ AM Twilight |
|
7:05:25 AM |
|
6:34:08 AM |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Sunset /
PM Twilight |
|
4:16:39 PM |
|
4:47:56 PM |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Length Of Day |
|
9:11:14 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Special Conditions |
|
None |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Comments |
|
|
|
|
|
|
|
|
|
|
|
| |
|
December
15, 2020 |
|
|
Record |
Record |
|
|
|
|
|
|
|
|
| Month-to-Date Summary |
|
Observed |
|
2019 |
|
Normal |
Depart |
Highest |
Lowest |
|
|
|
|
|
|
|
|
| Avg Maximum Temperature |
|
46.3 |
|
44.5 |
|
44.4 |
|
+1.9 |
|
54.8 |
|
in |
2015 |
|
30.1 |
|
in |
1904 |
|
|
|
|
|
|
|
|
|
| Avg
Minimum Temperature |
|
34.1 |
|
30.4 |
|
30.7 |
|
+3.4 |
|
42.3 |
|
in |
2015 |
|
16.1 |
|
in |
1989 |
|
|
|
|
|
|
|
|
|
| Average Temperature |
|
40.5 |
|
37.7 |
|
37.5 |
|
+2.9 |
|
48.9 |
|
in |
2015 |
|
24.6 |
|
in |
1904 |
|
|
|
|
|
|
|
|
|
| Total
Precipitation |
|
3.47 |
|
4.82 |
|
2.21 |
|
+1.26 |
|
6.64 |
|
in |
1936 |
|
.20 |
|
in |
1998 |
|
|
|
|
|
|
|
|
|
| Total Snow |
|
T |
|
8.0 |
|
2.9 |
|
-2.9 |
|
19.9 |
|
in |
1981 |
|
0.0 |
|
in |
2015 |
|
|
|
|
|
|
|
|
|
| Total
HDD |
|
368 |
|
409 |
|
408 |
|
-40 |
|
606 |
|
in |
1904 |
|
242 |
|
in |
2015 |
|
|
|
|
|
|
|
|
|
| Total CDD |
|
0 |
|
0 |
|
0 |
|
+0 |
|
0 |
|
in |
|
|
|
|
in |
|
|
|
|
|
|
|
|
|
|
| Avg Maximum Dew Point |
|
39.3 |
|
39.8 |
|
36.3 |
|
+3.0 |
|
49.1 |
|
in |
2015 |
|
18.0 |
|
in |
1989 |
|
|
|
|
|
|
|
|
|
| Avg
Minimum Dew Point |
|
26.6 |
|
23.2 |
|
21.3 |
|
+5.3 |
|
38.0 |
|
in |
2015 |
|
-1.5 |
|
in |
1989 |
|
|
|
|
|
|
|
|
|
| Average Dew Point |
|
33.1 |
|
31.9 |
|
28.8 |
|
+4.3 |
|
43.7 |
|
in |
2015 |
|
8.3 |
|
in |
1989 |
|
|
|
|
|
|
|
|
|
| |
|
December 15, 2020 |
|
|
Record |
Record |
|
|
|
|
|
|
|
|
| Year-to-Date Summary |
|
Observed |
|
2019 |
|
Normal |
Depart |
Highest |
Lowest |
|
|
|
|
|
|
|
|
| Total Precipitation |
|
40.35 |
|
54.32 |
|
46.19 |
|
-5.84 |
|
63.81 |
|
in |
1983 |
|
27.09 |
|
in |
1965 |
|
|
|
|
|
|
|
|
|
| Total
Snow (since Jul 1 20) |
|
0.6 |
|
8.0 |
|
4.0 |
|
-3.4 |
|
21.1 |
|
in |
1898 |
|
0.0 |
|
in |
2015 |
|
|
|
|
|
|
|
|
|
| Total HDD (since Jul 1
20) |
|
1161 |
|
1399 |
|
1440 |
|
-279 |
|
1918 |
|
in |
1904 |
|
1037 |
|
in |
2015 |
|
|
|
|
|
|
|
|
|
| Total
CDD (since Jan 1) |
|
871 |
|
731 |
|
563 |
|
+308 |
|
871 |
|
in |
2020 |
|
290 |
|
in |
1902 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Hour-by-Hour Weather For December 15, 2020 |
|
|
|
|
| Climate Weather for December 15 |
|
|
|
|
| Weather History For December 15 |
|
|
|
|
| Weather Calendar |
|
|
|
| Back To Weather Stat Page |
|
|
|
| Home |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|