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 | Humidity |
|---|---|---|---|---|---|---|
| January | 38° | 22° | 10 | 4.0 in | 6.1 h/day | 67% |
| February | 41° | 22° | 10 | 3.4 in | 6.8 h/day | 69% |
| March | 48° | 29° | 11 | 4.0 in | 8.1 h/day | 65% |
| April | 59° | 39° | 12 | 4.3 in | 8.4 h/day | 68% |
| May | 70° | 50° | 11 | 3.6 in | 9.8 h/day | 70% |
| June | 79° | 59° | 11 | 3.5 in | 10.9 h/day | 71% |
| July | 85° | 66° | 13 | 5.0 in | 11.2 h/day | 74% |
| August | 83° | 65° | 11 | 3.7 in | 10.5 h/day | 74% |
| September | 76° | 58° | 9 | 5.0 in | 8.7 h/day | 76% |
| October | 65° | 48° | 10 | 4.4 in | 7.5 h/day | 76% |
| November | 52° | 36° | 9 | 3.1 in | 6.7 h/day | 72% |
| December | 43° | 28° | 11 | 4.5 in | 5.6 h/day | 74% |
Hartford month by month
Hartford weather in January
January brings highs around 38°F (3°C), lows near 22°F (-5°C), about 10 wet days and roughly 3 snowy days - typically the coldest month of the year in Hartford.
Hartford weather in February
February brings highs around 41°F (5°C), lows near 22°F (-6°C), about 10 wet days and roughly 4 snowy days.
Hartford weather in March
March brings highs around 48°F (9°C), lows near 29°F (-2°C), about 11 wet days and roughly 2 snowy days.
Hartford weather in April
April brings highs around 59°F (15°C), lows near 39°F (4°C), about 12 wet days.
Hartford weather in May
May brings highs around 70°F (21°C), lows near 50°F (10°C), about 11 wet days.
Hartford weather in June
June brings highs around 79°F (26°C), lows near 59°F (15°C), about 11 wet days.
Hartford weather in July
July brings highs around 85°F (29°C), lows near 66°F (19°C), about 13 wet days - typically the hottest month and the sunniest month of the year in Hartford.
Hartford weather in August
August brings highs around 83°F (28°C), lows near 65°F (18°C), about 11 wet days.
Hartford weather in September
September brings highs around 76°F (24°C), lows near 58°F (15°C), about 9 wet days - typically the wettest month of the year in Hartford.
Hartford weather in October
October brings highs around 65°F (18°C), lows near 48°F (9°C), about 10 wet days.
Hartford weather in November
November brings highs around 52°F (11°C), lows near 36°F (2°C), about 9 wet days - typically the driest month of the year in Hartford.
Hartford weather in December
December brings highs around 43°F (6°C), lows near 28°F (-2°C), about 11 wet days and roughly 2 snowy days.
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.