Hartford, CT Climate & Monthly Averages
The climate of Hartford
Hartford spends most of the year cold. July, the warmest month, averages 85°F (29°C) by day - a figure many cities in our dataset pass in early spring - while January holds at 38°F (3°C) with 128 wet days a year across the whole calendar.
Climate quick facts
- Hottest month: July - highs near 85°F (29°C)
- Coldest month: January - highs near 38°F (3°C)
- Decade extremes (2015-2024): 99°F (37°C) high · -16°F (-26°C) low
- Wettest month: September (9 rainy days) · Sunniest: July (11.2 h sun/day)
- Climate type: humid subtropical
- Annual swing: 25°C between the average warmest and coolest month · day to night: 10°C
- Snow: about 14 days a year
- Months with freezing average lows: 4
- Average humidity: 71%
Temperatures through the year
Snow falls on roughly 14 days a year, mostly November through April. January bottoms out at 38°F (3°C) in daylight, 22°F (-5°C) after dark. Warmth peaks in July: highs of 85°F (29°C), lows of 66°F (19°C). The gridded 2015-2024 daily record for this location tops out at 99°F (37°C) and bottoms at -16°F (-26°C) - decade extremes, not all-time station records. Overnight lows average at or below freezing for 4 months, December through March.
Rain, sun and snow
Sunshine averages 8.4 hours a day over the year, peaking in July at 11.2 hours. Between the average July and the average January lie 25°C, a wider spread than roughly 84% of the cities we track. The wettest month is September (5.0 inches (127 mm) across 9 days) and the driest November.
How Hartford compares
- 28% of the year's precipitation falls in its wettest three months - more evenly spread than almost every other city we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 38° | 22° | 10 | 4.0 in | 6.1 h/day | 9.5 h | 31% | 67% |
| February | 41° | 22° | 10 | 3.4 in | 6.8 h/day | 10.5 h | 35% | 69% |
| March | 48° | 29° | 11 | 4.0 in | 8.1 h/day | 11.8 h | 35% | 65% |
| April | 59° | 39° | 12 | 4.3 in | 8.4 h/day | 13.3 h | 41% | 68% |
| May | 70° | 50° | 11 | 3.6 in | 9.8 h/day | 14.5 h | 36% | 70% |
| June | 79° | 59° | 11 | 3.5 in | 10.9 h/day | 15.2 h | 37% | 71% |
| July | 85° | 66° | 13 | 5.0 in | 11.2 h/day | 14.9 h | 42% | 74% |
| August | 83° | 65° | 11 | 3.7 in | 10.5 h/day | 13.8 h | 34% | 74% |
| September | 76° | 58° | 9 | 5.0 in | 8.7 h/day | 12.4 h | 29% | 76% |
| October | 65° | 48° | 10 | 4.4 in | 7.5 h/day | 11.0 h | 34% | 76% |
| November | 52° | 36° | 9 | 3.1 in | 6.7 h/day | 9.8 h | 30% | 72% |
| December | 43° | 28° | 11 | 4.5 in | 5.6 h/day | 9.2 h | 36% | 74% |
Hartford month by month
Average high and low for each month, with the bar showing where it sits in Hartford's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 10 days
- Sunshine
- 6.1 h
- Daylight
- 9.5 h
- Snow
- 3 days
February
- Rain
- 10 days
- Sunshine
- 6.8 h
- Daylight
- 10.5 h
- Snow
- 4 days
March
- Rain
- 11 days
- Sunshine
- 8.1 h
- Daylight
- 11.8 h
- Snow
- 2 days
April
- Rain
- 12 days
- Sunshine
- 8.4 h
- Daylight
- 13.3 h
May
- Rain
- 11 days
- Sunshine
- 9.8 h
- Daylight
- 14.5 h
June
- Rain
- 11 days
- Sunshine
- 10.9 h
- Daylight
- 15.2 h
July
- Rain
- 13 days
- Sunshine
- 11.2 h
- Daylight
- 14.9 h
August
- Rain
- 11 days
- Sunshine
- 10.5 h
- Daylight
- 13.8 h
September
- Rain
- 9 days
- Sunshine
- 8.7 h
- Daylight
- 12.4 h
October
- Rain
- 10 days
- Sunshine
- 7.5 h
- Daylight
- 11.0 h
November
- Rain
- 9 days
- Sunshine
- 6.7 h
- Daylight
- 9.8 h
December
- Rain
- 11 days
- Sunshine
- 5.6 h
- Daylight
- 9.2 h
- Snow
- 2 days
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
Seasons in Hartford
Spring (March through May)
Through spring, Hartford is mild: 59°F (15°C) by day, 39°F (4°C) after dark, and rain falls on around 34 of the 90 days, plus about 3 snowy days.
Summer (June through August)
Summer sits firmly in the heat here - highs near 82°F (28°C), nights near 63°F (17°C), and rain falls on around 35 of the 90 days. Daylight is generous - around 10.9 hours of sun a day.
Fall (September through November)
Fall in Hartford is mild, with daytime highs averaging 64°F (18°C) and nights around 47°F (8°C); expect showers on roughly 28 days across the season.
Winter (December through February)
Winter in Hartford is brisk and cold, with daytime highs averaging 40°F (5°C) and nights around 24°F (-4°C); rain falls on around 31 of the 90 days, plus about 10 snowy days.
Climate questions, answered
Does it freeze in Hartford?
How often does it rain in Hartford?
Is Hartford cold in winter?
Is Hartford humid?
Best time to visit Hartford
Aim for August to October and May to June if you get the choice: these are the warmest and brightest weeks of the year, and highs average 75°F (24°C) against roughly 10 wet days a month. For the same question asked the other way round, see where else is warm in August.
Pack for Hartford with light clothing for the warm months, a heavy insulated coat, hat and gloves for winter and a compact umbrella or rain shell. July nights average 66°F (19°C), so evenings rarely match the afternoons.
Hartford temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.