Climateby Month

Hartford, CT climate by month

NOAA 1991-2020 normals · 50 ft elevation

Summers in Hartford are warm and often humid; winters are cold and snowy. Highs peak at 85°F in July and fall to 37°F in January. Wet days are spread through the year, from about 9 to 13 a month. Normal snowfall is about 52 in a year. The most comfortable time to visit is May.

Warmest month
85°F
July normal high
Coldest month
20°F
January normal low
Wet days a year
128
42.8 in of precipitation
Snow a year
51.7 in
normal snowfall

How warm is Hartford?

Normal highs range from 37°F in January to 85°F in July.

20°40°60°80°100° January: normal high 37°F (3°C), low 20°F (-7°C) 37° 20° February: normal high 40°F (4°C), low 22°F (-6°C) March: normal high 48°F (9°C), low 30°F (-1°C) April: normal high 60°F (16°C), low 40°F (4°C) May: normal high 71°F (22°C), low 50°F (10°C) June: normal high 80°F (27°C), low 60°F (16°C) July: normal high 85°F (29°C), low 66°F (19°C) 85° 66° August: normal high 83°F (28°C), low 64°F (18°C) September: normal high 76°F (24°C), low 56°F (13°C) October: normal high 64°F (18°C), low 44°F (7°C) November: normal high 52°F (11°C), low 35°F (2°C) December: normal high 42°F (6°C), low 26°F (-3°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Hartford?

May has the most wet days (about 13); the year brings about 43 in of precipitation.

January: 10 wet days February: 9 wet days 9 March: 11 wet days April: 11 wet days May: 13 wet days 13 June: 11 wet days July: 11 wet days August: 10 wet days September: 10 wet days October: 11 wet days November: 10 wet days December: 11 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 51.7 in a year, most of it in February.

January: 14.2 in of snow February: 14.8 in of snow 14.8 March: 9.4 in of snow April: 1.1 in of snow May: 0.0 in of snow 0.0 June: 0.0 in of snow July: 0.0 in of snow August: 0.0 in of snow September: 0.0 in of snow October: 0.7 in of snow November: 1.4 in of snow December: 10.1 in of snow JFMAMJJASOND

How humid is Hartford?

Muggy days peak in July, at about 11 days.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 5 muggy days July: 11 muggy days 11 August: 10 muggy days September: 4 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Bradley International Airport, 12 mi N of the city center.

How much daylight?

Daylight ranges from about 9.2 hours in December to 15.2 hours in June.

January: 9.6 hours of daylight February: 10.6 hours of daylight March: 12.0 hours of daylight April: 13.4 hours of daylight May: 14.6 hours of daylight June: 15.2 hours of daylight 15.2 July: 14.9 hours of daylight August: 13.8 hours of daylight September: 12.5 hours of daylight October: 11.1 hours of daylight November: 9.8 hours of daylight December: 9.2 hours of daylight 9.2 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Hartford, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 37°F20°F 2.9 in10 14.2 in 0 9.6 h
February 40°F22°F 2.6 in9 14.8 in 0 10.6 h
March 48°F30°F 3.5 in11 9.4 in 0 12.0 h
April 60°F40°F 3.8 in11 1.1 in 0 13.4 h
May 71°F50°F 3.4 in13 0.0 in 0 14.6 h
June 80°F60°F 3.9 in11 0.0 in 5 15.2 h
July 85°F66°F 3.9 in11 0.0 in 11 14.9 h
August 83°F64°F 3.5 in10 0.0 in 10 13.8 h
September 76°F56°F 4.0 in10 0.0 in 4 12.5 h
October 64°F44°F 4.2 in11 0.7 in 0 11.1 h
November 52°F35°F 3.4 in10 1.4 in 0 9.8 h
December 42°F26°F 3.8 in11 10.1 in 0 9.2 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Hartford

By our comfort score, the best month is May.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 280621
Feb 340616
Mar 44278
Apr 61861
May 741771
Jun 671163
Jul 55477
Aug 57665
Sep 691551
Oct 611260
Nov 44363
Dec 300815

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Hartford

The last spring frost typically comes around Apr 17, and the first fall frost around Oct 26, leaving 191 frost-free days in a typical year.

Frost and freeze dates for Hartford
Typical date1 year in 10
Last spring frost (32°F)Apr 17after May 1
First fall frost (32°F)Oct 26before Oct 12
Last hard freeze (28°F)Apr 3after Apr 21
First hard freeze (28°F)Nov 5before Oct 22
Frost-free season191 daysunder 169 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Hartford Brainard Fld (USW00014752), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Connecticut.

Hottest and coldest readings, 1991-2020

The highest reading was 103°F (July 22, 2011); the lowest was -16°F (January 18, 1997).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Hartford

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain and frost dates: Hartford Brainard Fld (USW00014752), 2.6 mi SE of the city center, 19 ft . NOAA normals and daily records, 1991-2020.
  • Snowfall and humidity and wind by hour: Hartford Bradley Intl Airport (USW00014740), 12 mi N of the city center, 190 ft (140 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Snow depth: Burlington (USC00060973), 13 mi W of the city center, 505 ft (455 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Bradley International Airport (725080-14740), 12 mi N of the city center, 169 ft (119 ft higher than the city). Hourly observations, 1991-2020.
  • Not available for this location: cloud cover (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error