NOAA NCEI Climate Normals 1991–2020
Connecticut Weather by Month
Temperature, rain and the hurricane season at 22 Connecticut stations, month by month.
Data: NOAA NHC HURDAT2 and NOAA SPC tornado and hail reports, through 2025 · Updated
The median station records 49.7 inches of precipitation a year; Bakersville, CT records the most, 54.3 inches, and Groton New London Airport, CT the least, 39.2 (1.4 times as much). July is the hottest month at the median station (average high 83°F); the hottest July is at Hartford Bradley International Airport, CT, 85°F. January is the coldest (average low 19°F); the coldest January nights are at Staffordville, CT, 14°F. Highs reach 90°F on 10 days a year at the median station and on 20 at Danbury, CT, the most. Snowfall is heaviest at Norfolk 2 SW, CT, 74.9 inches a year.
This page compares the 1991–2020 NOAA climate normals of 22 Connecticut weather stations, each the nearest station with full normals to at least one of the 186 Connecticut cities on this site that have one within 25 miles.
At the median station, October is the wettest month (4.7 inches) and February the driest (3.2). Station by station, the wettest month is October at 10, March at 3 and April at 2 of the 22, and the driest February at 19, May at 2 and January at 1. The gap between the wettest and driest station is widest in July: 2.3 inches.
Month by month across Connecticut
High, low and precipitation are the median of the 22 stations; the station columns name the station with the highest average high, the lowest average low, and the most and least precipitation that month, each linked to the city page it serves. Source: NOAA NCEI U.S. Climate Normals 1991–2020.
Hurricane season in Connecticut
June to November, the hurricane season months, bring 52% of the year's precipitation at the median station, from 49% at Groton, CT to 57% at Falls Village, CT. Since 1851, 75 tropical systems have passed within 75 miles of a Connecticut city on this site, 17 of them at hurricane strength at their closest point to one; September has brought the most (27), then August (16). 2 came outside June to November.
| Month | Tropical systems | At hurricane strength | Median precip. in |
|---|---|---|---|
| Jan | 0 | 0 | 3.7 |
| Feb | 0 | 0 | 3.2 |
| Mar | 0 | 0 | 4.2 |
| Apr | 0 | 0 | 4.2 |
| May | 2 | 0 | 3.7 |
| Jun | 7 | 0 | 4.5 |
| Jul | 7 | 0 | 4.0 |
| Aug | 16 | 4 | 4.3 |
| Sep | 27 | 10 | 4.3 |
| Oct | 14 | 3 | 4.7 |
| Nov | 2 | 0 | 3.9 |
| Dec | 0 | 0 | 4.5 |
Tropical systems from NOAA NHC HURDAT2 that passed within 75 miles of a Connecticut city on this site, each counted once, in the month of its first such pass; hurricane strength is the track's wind at its closest point to a city.
Coastal water temperature by month
Across 3 NOAA tide stations, the water is warmest in August (median 75°F, up to 76°F at Bridgeport, CT) and coolest in February (median 39°F, down to 37°F at New Haven, CT). No month averages 80°F at the median station.
| Station | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| New London, CT | 41 | 39 | 43 | 49 | 56 | 64 | 71 | 71 | 70 | 63 | 55 | 46 |
| New Haven, CT | 39 | 37 | 41 | 48 | 57 | 65 | 74 | 75 | 72 | 63 | 53 | 43 |
| Bridgeport, CT | 42 | 39 | 42 | 48 | 56 | 65 | 73 | 76 | 74 | 66 | 56 | 46 |
°F, average of hourly readings 2021–2025; a month counts when at least three years have half their hours on record. Source: NOAA Tides & Currents; the newest readings are preliminary.
Connecticut cities and their stations
| City | Station | Miles | Hottest month high °F | Coldest month low °F | Year precip. in |
|---|---|---|---|---|---|
| Enfield | Hartford Bradley International Airport, CT | 7 | 85 | 19 | 47.1 |
| Windsor | Hartford Bradley International Airport, CT | 6 | 85 | 19 | 47.1 |
| Glastonbury | Hartford Brainard Field, CT | 5 | 85 | 20 | 42.9 |
| Avon | Burlington, CT | 4 | 84 | 17 | 53.5 |
How stations are matched to cities and what normals are: methodology · other states by month