| Climate data for New London (Groton) 1991–2020 normals, extremes 1957–2021 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 69 (21) |
67 (19) |
78 (26) |
88 (31) |
91 (33) |
95 (35) |
101 (38) |
99 (37) |
93 (34) |
87 (31) |
79 (26) |
69 (21) |
101 (38) |
| Mean maximum °F (°C) | 56.6 (13.7) |
55.8 (13.2) |
65.5 (18.6) |
73.6 (23.1) |
81.9 (27.7) |
88.0 (31.1) |
91.6 (33.1) |
88.7 (31.5) |
84.7 (29.3) |
76.5 (24.7) |
67.4 (19.7) |
60.0 (15.6) |
92.6 (33.7) |
| Mean daily maximum °F (°C) | 38.8 (3.8) |
40.8 (4.9) |
47.3 (8.5) |
56.9 (13.8) |
66.4 (19.1) |
75.2 (24.0) |
80.8 (27.1) |
79.8 (26.6) |
73.6 (23.1) |
63.3 (17.4) |
53.2 (11.8) |
44.1 (6.7) |
60.0 (15.6) |
| Daily mean °F (°C) | 31.3 (−0.4) |
32.9 (0.5) |
39.5 (4.2) |
48.9 (9.4) |
58.1 (14.5) |
67.3 (19.6) |
73.4 (23.0) |
72.5 (22.5) |
65.8 (18.8) |
55.2 (12.9) |
45.5 (7.5) |
36.8 (2.7) |
52.3 (11.3) |
| Mean daily minimum °F (°C) | 23.8 (−4.6) |
24.9 (−3.9) |
31.6 (−0.2) |
40.9 (4.9) |
49.9 (9.9) |
59.3 (15.2) |
65.9 (18.8) |
65.1 (18.4) |
58.0 (14.4) |
47.1 (8.4) |
37.9 (3.3) |
29.5 (−1.4) |
44.5 (6.9) |
| Mean minimum °F (°C) | 4.1 (−15.5) |
6.9 (−13.9) |
14.7 (−9.6) |
29.0 (−1.7) |
38.1 (3.4) |
46.8 (8.2) |
56.0 (13.3) |
54.2 (12.3) |
43.6 (6.4) |
32.2 (0.1) |
26.6 (−3.0) |
14.2 (−9.9) |
1.5 (−16.9) |
| Record low °F (°C) | −14 (−26) |
−12 (−24) |
0 (−18) |
14 (−10) |
30 (−1) |
38 (3) |
47 (8) |
41 (5) |
29 (−2) |
22 (−6) |
8 (−13) |
−10 (−23) |
−14 (−26) |
| Average precipitation inches (mm) | 3.91 (99) |
3.42 (87) |
4.92 (125) |
4.40 (112) |
3.67 (93) |
3.93 (100) |
3.42 (87) |
4.19 (106) |
4.29 (109) |
4.42 (112) |
3.75 (95) |
4.59 (117) |
48.91 (1,242) |
| Average snowfall inches (cm) | 5.8 (15) |
8.3 (21) |
3.9 (9.9) |
0.8 (2.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.5 (1.3) |
5.2 (13) |
24.5 (62) |
| Average precipitation days (≥ 0.01 in) | 11.4 | 9.7 | 11.5 | 11.6 | 11.9 | 9.5 | 9.7 | 9.3 | 10.2 | 10.4 | 10.0 | 12.4 | 127.6 |
| Average snowy days (≥ 0.1 in) | 3.1 | 2.7 | 1.7 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 1.9 | 9.9 |
| Source: NOAA[1][2] | |||||||||||||
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 2, 2021.
- ^ "Station: Groton, CT". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Retrieved June 2, 2021.