Hartford, CT Climate & Monthly Averages
Hartford has a humid subtropical climate. July is the hottest month, averaging 85° by day; January is the coldest at 38°.
Hartford's climate is a story of contrasts
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.
July
85° by day 66° at nightJanuary
38° by day 22° at nightThe two ends of 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.
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.
More climate facts for Hartford
- 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%
Four distinct parts of the year 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.
Hartford temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.
Choosing a season in Hartford
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.
What to pack
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.
Monthly highs, lows and seasonal change
| 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 from the coldest month to the hottest
Each card shows the average high and low. The bar places that month between Hartford's coldest night and 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
Looking for warmer alternatives? Browse warm places by month, or compare Hartford's coolest part of the year: January, February, December.
Where Hartford sits among other climates
- 28% of the year's precipitation falls in its wettest three months - more evenly spread than almost every other city we track.
These comparisons use the same ten-year window for every city in the dataset.