Collinsville has chilly, snowy winters and pleasant summers, with plenty of rain
A typical July afternoon reaches 84°, a January night drops to 17°, and about 39 inches of snow falls in a normal winter.
A year in Collinsville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Collinsville’s climate
Read from where Collinsville sits among Connecticut’s towns. The page puts what stands out first.
39 inches of snow, 52 of rain and melt
October is the wettest month and February the driest. Rain or snow falls on about 123 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Warmer than it used to be
The last 30 years in Collinsville averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.3°).
A bigger shift than in 83% of U.S. towns.
Change by month
About 172 frost-free days a year
In half of years the last 32° night comes by April 25 and the first by October 18.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
What a year in Collinsville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Living with Collinsville’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
172 frost-free days. The last frost comes by Apr 25 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 18.
About 39" a winter over 10 days with an inch or more, most in February. Snow covers the ground about 42 days a year.
Months averaging under 55° run from October through April. Heating is 90% of the year’s heating-and-cooling load.
About 13 days a year reach 90°, and July afternoons average 84°.
The nicest months are May, June, July, August, September and October. 2.9 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →Collinsville and its neighbors
New Hartford has the coldest January nights next door (16°) and Avon the hottest July afternoons (85°). Tap a town to see its climate.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
How Collinsville compares
Against every U.S. town on TownTapestry, each counted once, with its place in Connecticut.
Collinsville 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 | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 35° | 17° | 3.7" | 11.1" | 10 | 13 | 18° – 33° |
| February | 38° | 19° | 3.3" | 11.8" | 9 | 13 | 14° – 35° |
| March | 46° | 26° | 4.3" | 5.5" | 10 | 9 | 29° – 46° |
| April | 59° | 35° | 4.3" | 0.5" | 11 | 0 | 42° – 52° |
| May | 71° | 46° | 4.0" | 0 | 12 | 0 | 53° – 64° |
| June | 79° | 55° | 4.7" | 0 | 11 | 0 | 64° – 70° |
| July | 84° | 61° | 4.4" | 0 | 11 | 0 | 67° – 76° |
| August | 82° | 59° | 4.5" | 0 | 10 | 0 | 66° – 73° |
| September | 74° | 52° | 4.8" | 0 | 9 | 0 | 60° – 67° |
| October | 62° | 40° | 5.4" | 0.6" | 10 | 0 | 47° – 58° |
| November | 50° | 31° | 4.0" | 0.8" | 9 | 1 | 37° – 46° |
| December | 40° | 23° | 4.7" | 8.3" | 11 | 7 | 25° – 42° |
| Year | 60° | 39° | 52.2" | 38.6" | 123 | 42 |
Heating and cooling a home in Collinsville
90% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 14° to 35°. June is the most reliable, staying within 6°.
Common questions about Collinsville’s climate
What is the coldest month in Collinsville?
January, with a typical high of 35° and a low of 17°.
What is the hottest month in Collinsville?
July, with a typical high of 84° and a low of 61°. About 13 days a year reach 90°.
How much snow does Collinsville get?
About 39 inches in a normal winter, most of it in February.
When is the first frost in Collinsville?
In half of years the first 32° night comes by October 18, and the last spring frost by April 25.
What is the rainiest month in Collinsville?
October, with 5.4 inches of rain and melted snow. The year totals 52 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Collinsville.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Collinsville itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Burlington, CT (2 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.