Connecticut climate guide

Temperature in Connecticut (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
1°C maximum daytime temperature in January in Connecticut (Hartford)1
2°C maximum daytime temperature in February in Connecticut (Hartford)2
8°C maximum daytime temperature in March in Connecticut (Hartford)8
15°C maximum daytime temperature in April in Connecticut (Hartford)15
21°C maximum daytime temperature in May in Connecticut (Hartford)21
26°C maximum daytime temperature in June in Connecticut (Hartford)26
28°C maximum daytime temperature in July in Connecticut (Hartford)28
28°C maximum daytime temperature in August in Connecticut (Hartford)28
23°C maximum daytime temperature in September in Connecticut (Hartford)23
18°C maximum daytime temperature in October in Connecticut (Hartford)18
11°C maximum daytime temperature in November in Connecticut (Hartford)11
3°C maximum daytime temperature in December in Connecticut (Hartford)3
Min temperature (night-time)
-9°C minimum night-time temperature in January in Connecticut (Hartford)-9
-7°C minimum night-time temperature in February in Connecticut (Hartford)-7
-2°C minimum night-time temperature in March in Connecticut (Hartford)-2
3°C minimum night-time temperature in April in Connecticut (Hartford)3
8°C minimum night-time temperature in May in Connecticut (Hartford)8
13°C minimum night-time temperature in June in Connecticut (Hartford)13
17°C minimum night-time temperature in July in Connecticut (Hartford)17
16°C minimum night-time temperature in August in Connecticut (Hartford)16
11°C minimum night-time temperature in September in Connecticut (Hartford)11
5°C minimum night-time temperature in October in Connecticut (Hartford)5
0°C minimum night-time temperature in November in Connecticut (Hartford)0
-6°C minimum night-time temperature in December in Connecticut (Hartford)-6

Sunshine & Daylight in Connecticut

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
6 hours of sunshine per day (58% of daylight hours) in January in Connecticut6
6 hours of sunshine per day (59% of daylight hours) in February in Connecticut6
7 hours of sunshine per day (58% of daylight hours) in March in Connecticut7
8 hours of sunshine per day (58% of daylight hours) in April in Connecticut8
8 hours of sunshine per day (58% of daylight hours) in May in Connecticut8
9 hours of sunshine per day (59% of daylight hours) in June in Connecticut9
9 hours of sunshine per day (63% of daylight hours) in July in Connecticut9
9 hours of sunshine per day (62% of daylight hours) in August in Connecticut9
7 hours of sunshine per day (59% of daylight hours) in September in Connecticut7
6 hours of sunshine per day (58% of daylight hours) in October in Connecticut6
5 hours of sunshine per day (48% of daylight hours) in November in Connecticut5
5 hours of sunshine per day (49% of daylight hours) in December in Connecticut5
Daily hours of daylight
10 hours of daylight per day in January in Connecticut (Hartford)10
11 hours of daylight per day in February in Connecticut (Hartford)11
12 hours of daylight per day in March in Connecticut (Hartford)12
13 hours of daylight per day in April in Connecticut (Hartford)13
15 hours of daylight per day in May in Connecticut (Hartford)15
15 hours of daylight per day in June in Connecticut (Hartford)15
15 hours of daylight per day in July in Connecticut (Hartford)15
14 hours of daylight per day in August in Connecticut (Hartford)14
12 hours of daylight per day in September in Connecticut (Hartford)12
11 hours of daylight per day in October in Connecticut (Hartford)11
10 hours of daylight per day in November in Connecticut (Hartford)10
9 hours of daylight per day in December in Connecticut (Hartford)9

Rainfall in Connecticut

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
11 days with some rainfall in January in Connecticut (Hartford)11
10 days with some rainfall in February in Connecticut (Hartford)10
11 days with some rainfall in March in Connecticut (Hartford)11
11 days with some rainfall in April in Connecticut (Hartford)11
12 days with some rainfall in May in Connecticut (Hartford)12
11 days with some rainfall in June in Connecticut (Hartford)11
9 days with some rainfall in July in Connecticut (Hartford)9
10 days with some rainfall in August in Connecticut (Hartford)10
9 days with some rainfall in September in Connecticut (Hartford)9
8 days with some rainfall in October in Connecticut (Hartford)8
11 days with some rainfall in November in Connecticut (Hartford)11
12 days with some rainfall in December in Connecticut (Hartford)12
Average monthly rainfall (mm)
84 mm monthly rainfall in January in Connecticut (Hartford)84
79 mm monthly rainfall in February in Connecticut (Hartford)79
92 mm monthly rainfall in March in Connecticut (Hartford)92
100 mm monthly rainfall in April in Connecticut (Hartford)100
101 mm monthly rainfall in May in Connecticut (Hartford)101
95 mm monthly rainfall in June in Connecticut (Hartford)95
88 mm monthly rainfall in July in Connecticut (Hartford)88
93 mm monthly rainfall in August in Connecticut (Hartford)93
95 mm monthly rainfall in September in Connecticut (Hartford)95
90 mm monthly rainfall in October in Connecticut (Hartford)90
100 mm monthly rainfall in November in Connecticut (Hartford)100
97 mm monthly rainfall in December in Connecticut (Hartford)97

More climate for Connecticut

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Connecticut (Hartford)1
UV (maximum) index 2 (Low) in February in Connecticut (Hartford)2
UV (maximum) index 4 (Moderate) in March in Connecticut (Hartford)4
UV (maximum) index 6 (High) in April in Connecticut (Hartford)6
UV (maximum) index 7 (High) in May in Connecticut (Hartford)7
UV (maximum) index 8 (Very High) in June in Connecticut (Hartford)8
UV (maximum) index 8 (Very High) in July in Connecticut (Hartford)8
UV (maximum) index 8 (Very High) in August in Connecticut (Hartford)8
UV (maximum) index 6 (High) in September in Connecticut (Hartford)6
UV (maximum) index 4 (Moderate) in October in Connecticut (Hartford)4
UV (maximum) index 2 (Low) in November in Connecticut (Hartford)2
UV (maximum) index 1 (Low) in December in Connecticut (Hartford)1
Heat & Humidity
No heat & humidity in January in Connecticut (Hartford)0
No heat & humidity in February in Connecticut (Hartford)0
No heat & humidity in March in Connecticut (Hartford)0
No heat & humidity in April in Connecticut (Hartford)0
No heat & humidity in May in Connecticut (Hartford)0
Low heat & humidity in June in Connecticut (Hartford)L
Moderate heat & humidity in July in Connecticut (Hartford)M
Moderate heat & humidity in August in Connecticut (Hartford)M
No heat & humidity in September in Connecticut (Hartford)0
No heat & humidity in October in Connecticut (Hartford)0
No heat & humidity in November in Connecticut (Hartford)0
No heat & humidity in December in Connecticut (Hartford)0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Going to Connecticut? Find the best month to visit Connecticut based on the weather.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Check climate guides for Connecticut showing average temperature, rainfall & sunshine figures for each month of the year. The climate guide shown above is for Hartford.

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More about Connecticut

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

The climate guide for Connecticut, represented by Hartford, shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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