Darien Downtown has chilly, snowy winters and warm summers
A typical July afternoon reaches 85°, a January night drops to 24°, and about 34 inches of snow falls in a normal winter.
A year in Darien Downtown at a glance
Each month’s typical high and low, and what it brings.
What stands out about Darien Downtown’s climate
Read from where Darien Downtown sits among Connecticut’s towns. The page puts what stands out first.
What a year in Darien Downtown feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Warmer than it used to be
The last 30 years in Darien Downtown averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 98% of U.S. towns.
Change by month
About 188 frost-free days a year
In half of years the last 32° night comes by April 17 and the first by October 23.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
34 inches of snow, 47 of rain and melt
September is the wettest month and February the driest. Rain or snow falls on about 124 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Living with Darien Downtown’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
188 frost-free days. The last frost comes by Apr 17 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 23.
About 34" a winter over 10 days with an inch or more, most in February.
Months averaging under 55° run from November through April. Heating is 86% of the year’s heating-and-cooling load.
About 18 days a year reach 90°, and July afternoons average 85°.
The nicest months are May, June, August, September and October. 0.6 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 →Darien Downtown and its neighbors
Noroton has the coldest January nights next door (24°) and Noroton 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 Darien Downtown compares
Against every U.S. town on TownTapestry, each counted once, with its place in Connecticut.
Darien Downtown 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 | 40° | 24° | 3.5" | 9.1" | 11 | 24° – 39° |
| February | 42° | 25° | 2.9" | 11.9" | 8 | 21° – 40° |
| March | 49° | 32° | 4.1" | 5.9" | 10 | 35° – 49° |
| April | 61° | 41° | 4.1" | 0.5" | 12 | 46° – 56° |
| May | 70° | 51° | 3.9" | 0 | 12 | 56° – 65° |
| June | 79° | 60° | 4.3" | 0 | 12 | 67° – 73° |
| July | 85° | 67° | 4.1" | 0 | 9 | 71° – 79° |
| August | 83° | 65° | 4.1" | 0 | 9 | 70° – 78° |
| September | 76° | 59° | 4.5" | 0 | 9 | 64° – 72° |
| October | 65° | 47° | 4.4" | 0 | 10 | 52° – 63° |
| November | 54° | 38° | 3.5" | 0.8" | 10 | 41° – 50° |
| December | 44° | 30° | 4.1" | 5.8" | 11 | 30° – 48° |
| Year | 62° | 45° | 47.3" | 34.0" | 124 |
Heating and cooling a home in Darien Downtown
86% 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 21° to 40°. June is the most reliable, staying within 6°.
Common questions about Darien Downtown’s climate
What is the coldest month in Darien Downtown?
January, with a typical high of 40° and a low of 24°.
What is the hottest month in Darien Downtown?
July, with a typical high of 85° and a low of 67°. About 18 days a year reach 90°.
How much snow does Darien Downtown get?
About 34 inches in a normal winter, most of it in February.
When is the first frost in Darien Downtown?
In half of years the first 32° night comes by October 23, and the last spring frost by April 17.
What is the rainiest month in Darien Downtown?
September, with 4.5 inches of rain and melted snow. The year totals 47 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Darien Downtown.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Darien Downtown itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Stamford 5 N, CT (5 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.