South Windsor, CT climate
South Windsor has chilly, snowy winters and warm summers. A typical July afternoon reaches 85°, a January night drops to 19°, and about 52 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in South Windsor feels like
Winter
Spring
Summer
Fall
South Windsor weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 37° | 19° | 3.2" | 14.2" | 11 | 19° – 34° |
| February | 40° | 21° | 2.9" | 14.8" | 11 | 16° – 36° |
| March | 48° | 28° | 3.9" | 9.4" | 11 | 31° – 47° |
| April | 61° | 37° | 3.9" | 1.1" | 12 | 44° – 54° |
| May | 72° | 48° | 3.5" | 0 | 12 | 54° – 65° |
| June | 80° | 57° | 4.2" | 0 | 12 | 66° – 72° |
| July | 85° | 63° | 4.0" | 0 | 11 | 69° – 77° |
| August | 83° | 61° | 4.1" | 0 | 10 | 69° – 76° |
| September | 76° | 53° | 4.1" | 0 | 9 | 62° – 68° |
| October | 64° | 42° | 4.5" | 0.7" | 11 | 49° – 59° |
| November | 52° | 33° | 3.6" | 1.4" | 10 | 38° – 47° |
| December | 41° | 25° | 4.1" | 10.1" | 12 | 26° – 43° |
| Year | 61° | 40° | 45.8" | 51.7" | 130 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in South Windsor
South Windsor gets 46 inches of rain and melted snow a year. October is the wettest month and February the driest. Rain or snow falls on about 130 days a year.
About 177 frost-free days a year
In half of years the last 32° night comes by April 21 and the first one by October 16. That leaves about 177 frost-free days for gardens, shorter than 51% of U.S. towns.
Heating and cooling a home in South Windsor
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In South Windsor, 88% of that work is heating and 12% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
South Windsor and its neighbors
South Windsor borders 7 towns with climate data. January nights across them vary by 1.5°. Ellington has the coldest January nights (18°) and Windsor the hottest July afternoons (85°). South Windsor’s January low is 19° and its July high 85°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How South Windsor compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in South Windsor averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.4°). The shift is larger than in 88% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at South Windsor’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 16° to 36°. June is the most reliable, staying within 6°.
Common questions about South Windsor’s climate
What is the coldest month in South Windsor?
January, with a typical high of 37° and a low of 19°.
What is the hottest month in South Windsor?
July, with a typical high of 85° and a low of 63°. About 20 days a year reach 90°.
How much snow does South Windsor get?
About 52 inches in a normal winter, most of it in February.
When is the first frost in South Windsor?
In half of years the first 32° night comes by October 16, and the last spring frost by April 21.
What is the rainiest month in South Windsor?
October, with 4.5 inches of rain and melted snow. The year totals 46 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for South Windsor itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Hartford Bradley Intl Airport, CT (9 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.