Cos Cob and Old Greenwich have remarkably similar climates.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Cos Cob | Metric | Old Greenwich |
|---|---|---|
| 202 days | Sunny daysclear or partly cloudy skies | 202 days |
| 44 in | Precipitationper year | 44 in |
| 122 days | Wet daysrain or snow per year | 122 days |
| 33 in | Snowfallper year | 33 in |
| 14 days | Hot daysabove 90 °F | 14 days |
| 106 days | Freezing nightsat or below 32 °F | 105 days |
| 73% | Humidityaverage relative | 73% |
| 53 °F | Average temperatureyear round | 53 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cos Cob high | 38 | 41 | 49 | 61 | 71 | 79 | 84 | 82 | 75 | 64 | 53 | 43 |
| Old Greenwich high | 38 | 41 | 48 | 61 | 71 | 79 | 84 | 82 | 75 | 64 | 53 | 43 |
| Cos Cob low | 22 | 24 | 31 | 40 | 50 | 59 | 65 | 63 | 56 | 45 | 36 | 28 |
| Old Greenwich low | 23 | 24 | 31 | 40 | 50 | 59 | 65 | 64 | 57 | 46 | 36 | 28 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cos Cob | 3.3 | 3.1 | 4.1 | 3.6 | 3.4 | 3.7 | 3.6 | 4.1 | 3.7 | 4.0 | 3.2 | 4.1 |
| Old Greenwich | 3.3 | 3.1 | 4.1 | 3.6 | 3.4 | 3.7 | 3.6 | 4.1 | 3.7 | 4.0 | 3.2 | 4.1 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cos Cob | 17 | 16 | 17 | 15 | 15 | 15 | 19 | 18 | 18 | 19 | 17 | 17 |
| Old Greenwich | 17 | 16 | 17 | 15 | 15 | 15 | 19 | 18 | 18 | 19 | 17 | 17 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Cos Cob vs another city
- Cos Cob vs Riverside, CT
- Cos Cob vs Greenwich, CT
- Cos Cob vs Stamford, CT
- Cos Cob vs Byram, CT
- Cos Cob vs Port Chester, NY
- Cos Cob vs New York, NY
- Cos Cob vs Los Angeles, CA
- Cos Cob vs Chicago, IL
- Cos Cob vs Houston, TX
- Cos Cob vs Phoenix, AZ
- Cos Cob vs Philadelphia, PA
Old Greenwich vs another city
- Old Greenwich vs Riverside, CT
- Old Greenwich vs Greenwich, CT
- Old Greenwich vs Stamford, CT
- Old Greenwich vs Byram, CT
- Old Greenwich vs Noroton, CT
- Old Greenwich vs New York, NY
- Old Greenwich vs Los Angeles, CA
- Old Greenwich vs Chicago, IL
- Old Greenwich vs Houston, TX
- Old Greenwich vs Phoenix, AZ
- Old Greenwich vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).