Old Greenwich, CT weather and climate
Fairfield County, CT · population 6,904 · about 7 ft elevation
Everything below is a 30 year average for 1991-2020, computed from daily climate history at Old Greenwich's own coordinates.
The year at a glance
- Sunny days
- 202
- clear or partly cloudy, per year
- Precipitation
- 44 in
- per year
- Wet days
- 122
- rain or snow per year
- Snowfall
- 33 in
- per year
- Hot days
- 14
- above 90 °F
- Freezing nights
- 105
- at or below 32 °F
- Humidity
- 73%
- average relative
- Average temperature
- 53 °F
- year round
Monthly temperatures
Average daily high and low for each month, in °F.
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daily high | 38 | 41 | 48 | 61 | 71 | 79 | 84 | 82 | 75 | 64 | 53 | 43 |
| Daily 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.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Old Greenwich | 17 | 16 | 17 | 15 | 15 | 15 | 19 | 18 | 18 | 19 | 17 | 17 |
Compare Old Greenwich with another city
Nearby cities and popular picks. Any two cities can be compared from the home page.
- Old Greenwich vs Riverside, CT
- Old Greenwich vs Cos Cob, 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
Figures are 30 year averages for 1991-2020. 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).
Citing this page
Writing about Old Greenwich's climate in a report or paper? Cite this page directly. The reference period is part of the citation, so it stays accurate even as individual numbers are refined; add an access date in whatever citation style you use.
VSWeather. Old Greenwich, CT weather and climate: 1991-2020 climate normals. https://vsweather.com/weather/old-greenwich-ct/. Computed from Open-Meteo historical reanalysis, station-calibrated against NOAA NCEI climate normals.
BibTeX entry
@misc{vsweather_old_greenwich_ct,
author = {{VSWeather}},
title = {Old Greenwich, CT weather and climate: 1991-2020 climate normals},
howpublished = {\url{https://vsweather.com/weather/old-greenwich-ct/}},
note = {Computed from Open-Meteo historical reanalysis, station-calibrated against NOAA NCEI climate normals}
}How to cite VSWeather explains the sources and verification behind these numbers.