Cos Cob, Connecticut Climate
United States
Pop. 6,770 Elev. 20 m / 66 ft
TZ: America/New_York (UTC-4) ·
Summers in Cos Cob are mild, with July highs around 84°F (29°C), while winters are cold with January lows of 25°F (-4°C). Humidity pushes the summer feels-like temperature to 93°F (34°C), while wind chill can drive winter lows to 17°F (-8°C). Expect around 63 rainy days annually (38.2 in / 971 mm total), with snow on 3 days and 31 in (780 mm) of annual accumulation. The city averages 127 sunny days per year and around 34 thunderstorm days. Ocean water temperatures reach 80°F (26°C) in summer.
| Temperature | 84°F (29°C) high | 25°F (-4°C) low |
| Feels like | 93°F (34°C) high | 17°F (-9°C) low |
| Rain | 63 days | 38.2 in (971 mm) /yr |
| Snow | 3 days | 30.7 in (780 mm) /yr |
| Sky | 127 sunny | 34 stormy |
| Wind | 3.0 mph (1.3 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Apr, Jun, Jul, Aug, Sep
Sky & Air by Month
Cloud cover (%)
42
Jan 63
Feb 55
Mar 67
Apr 72
May 66
Jun 57
Jul 42
Aug 52
Sep 42
Oct 50
Nov 55
Dec Humidity (%)
61
Jan 63
Feb 60
Mar 60
Apr 74
May 72
Jun 75
Jul 68
Aug 75
Sep 69
Oct 65
Nov 64
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 6 mi Westchester County Airport (HPN)
Ski resort 32 mi Fahnestock Winter Park
National park 108 mi Connecticut River Greenway State Park
Mountain peak
(4,971 ft) 213 mi Schofield Cobble
Hospital 2 mi Greenwich Hospital
Hiking trail 3 mi Laurel Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 36°F 2°C | 25°F -4°C | 0.9 in 22 mm | 4.8 in123 mm | 16 |
| February | 39°F 4°C | 28°F -2°C | 1.7 in 44 mm | 13.8 in352 mm | 6 |
| March | 52°F 11°C | 37°F 3°C | 4.0 in 101 mm | 0.0 in1 mm | 11 |
| April | 60°F 16°C | 46°F 8°C | 3.7 in 95 mm | 0.6 in14 mm | 5 |
| May | 67°F 19°C | 55°F 13°C | 6.5 in 166 mm | — | 6 |
| June | 78°F 26°C | 66°F 19°C | 2.0 in 50 mm | — | 8 |
| July | 84°F 29°C | 73°F 23°C | 4.0 in 100 mm | — | 10 |
| August | 79°F 26°C | 65°F 19°C | 1.9 in 48 mm | — | 15 |
| September | 75°F 24°C | 63°F 17°C | 3.1 in 80 mm | — | 10 |
| October | 64°F 18°C | 52°F 11°C | 6.2 in 158 mm | — | 18 |
| November | 52°F 11°C | 41°F 5°C | 2.3 in 59 mm | 0.1 in1 mm | 13 |
| December | 39°F 4°C | 29°F -2°C | 1.8 in 46 mm | 11.4 in289 mm | 9 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 16 | 1 |
| February | 6 | 1 |
| March | 11 | 1 |
| April | 5 | 4 |
| May | 6 | 8 |
| June | 8 | 2 |
| July | 10 | 4 |
| August | 15 | 1 |
| September | 10 | 5 |
| October | 18 | 4 |
| November | 13 | 2 |
| December | 9 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 44°F 6°C | 33°F 0°C |
| February | 39°F 4°C | 32°F 0°C |
| March | 45°F 7°C | 37°F 3°C |
| April | 51°F 10°C | 46°F 8°C |
| May | 58°F 14°C | 58°F 14°C |
| June | 73°F 23°C | 68°F 20°C |
| July | 80°F 26°C | 79°F 26°C |
| August | 78°F 26°C | 74°F 23°C |
| September | 73°F 23°C | 69°F 20°C |
| October | 70°F 21°C | 59°F 15°C |
| November | 59°F 15°C | 47°F 8°C |
| December | 51°F 10°C | 35°F 2°C |