East Haddam, CT climate
East Haddam has chilly winters and pleasant summers, with plenty of rain. A typical July afternoon reaches 83°, a January night drops to 20°, and about 28 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in East Haddam feels like
Winter
Spring
Summer
Fall
East Haddam 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 | 37° | 20° | 3.8" | 9.0" | 11 | 10 | 20° – 35° |
| February | 40° | 21° | 3.0" | 7.1" | 10 | 10 | 17° – 37° |
| March | 47° | 28° | 4.3" | 5.0" | 10 | 4 | 32° – 46° |
| April | 59° | 37° | 4.3" | 0.8" | 11 | 0 | 44° – 52° |
| May | 69° | 47° | 3.7" | 0 | 11 | 0 | 53° – 62° |
| June | 77° | 56° | 4.3" | 0 | 10 | 0 | 64° – 70° |
| July | 83° | 62° | 3.5" | 0 | 9 | 0 | 68° – 76° |
| August | 81° | 61° | 4.1" | 0 | 9 | 0 | 67° – 75° |
| September | 74° | 53° | 4.3" | 0 | 9 | 0 | 61° – 68° |
| October | 63° | 43° | 4.8" | 0 | 10 | 0 | 49° – 59° |
| November | 52° | 34° | 4.1" | 0.3" | 9 | 0 | 38° – 47° |
| December | 42° | 25° | 4.6" | 5.6" | 11 | 6 | 27° – 44° |
| Year | 60° | 40° | 48.8" | 27.8" | 120 | 30 |
“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 East Haddam
East Haddam gets 49 inches of rain and melted snow a year. October is the wettest month and February the driest. Rain or snow falls on about 120 days a year. Snow covers the ground about 30 days of the year.
About 167 frost-free days a year
In half of years the last 32° night comes by April 28 and the first one by October 13. That leaves about 167 frost-free days for gardens, shorter than 64% of U.S. towns.
Heating and cooling a home in East Haddam
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In East Haddam, 91% of that work is heating and 9% 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.
East Haddam and its neighbors
East Haddam borders 6 towns with climate data. January nights across them vary by 1.7°. East Hampton has the coldest January nights (19°) and Haddam the hottest July afternoons (84°). East Haddam’s January low is 20° and its July high 83°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How East Haddam 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 East Haddam averaged 2.0° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 94% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at East Haddam’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 17° to 37°. June is the most reliable, staying within 5°.
Common questions about East Haddam’s climate
What is the coldest month in East Haddam?
January, with a typical high of 37° and a low of 20°.
What is the hottest month in East Haddam?
July, with a typical high of 83° and a low of 62°. About 11 days a year reach 90°.
How much snow does East Haddam get?
About 28 inches in a normal winter, most of it in January.
When is the first frost in East Haddam?
In half of years the first 32° night comes by October 13, and the last spring frost by April 28.
What is the rainiest month in East Haddam?
October, with 4.8 inches of rain and melted snow. The year totals 49 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for East Haddam itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Norwich Public Utility Plt, CT (17 mi, snow) and Willimantic Windham Airport, CT (21 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.