Connecticut weather by month

Check out Connecticut weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum daytime temperature °C
1°C maximum daytime temperature in January in Hartford1
2°C maximum daytime temperature in February in Hartford2
8°C maximum daytime temperature in March in Hartford8
15°C maximum daytime temperature in April in Hartford15
21°C maximum daytime temperature in May in Hartford21
26°C maximum daytime temperature in June in Hartford26
28°C maximum daytime temperature in July in Hartford28
28°C maximum daytime temperature in August in Hartford28
23°C maximum daytime temperature in September in Hartford23
18°C maximum daytime temperature in October in Hartford18
11°C maximum daytime temperature in November in Hartford11
3°C maximum daytime temperature in December in Hartford3
Hours of sunshine (daily)
Days with some rainfall
11 days with some rainfall in January in Hartford11
10 days with some rainfall in February in Hartford10
11 days with some rainfall in March in Hartford11
11 days with some rainfall in April in Hartford11
12 days with some rainfall in May in Hartford12
11 days with some rainfall in June in Hartford11
9 days with some rainfall in July in Hartford9
10 days with some rainfall in August in Hartford10
9 days with some rainfall in September in Hartford9
8 days with some rainfall in October in Hartford8
11 days with some rainfall in November in Hartford11
12 days with some rainfall in December in Hartford12

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Connecticut by month

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

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The climate guide for Connecticut (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.

Connecticut temperature by month

Compare the average temperature by month for popular destinations in Connecticut. Select a place from below to see more long term weather averages by month.

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hartford
1°C maximum daytime temperature in January in Hartford1
2°C maximum daytime temperature in February in Hartford2
8°C maximum daytime temperature in March in Hartford8
15°C maximum daytime temperature in April in Hartford15
21°C maximum daytime temperature in May in Hartford21
26°C maximum daytime temperature in June in Hartford26
28°C maximum daytime temperature in July in Hartford28
28°C maximum daytime temperature in August in Hartford28
23°C maximum daytime temperature in September in Hartford23
18°C maximum daytime temperature in October in Hartford18
11°C maximum daytime temperature in November in Hartford11
3°C maximum daytime temperature in December in Hartford3
Mystic
2°C maximum daytime temperature in January in Mystic2
3°C maximum daytime temperature in February in Mystic3
8°C maximum daytime temperature in March in Mystic8
13°C maximum daytime temperature in April in Mystic13
19°C maximum daytime temperature in May in Mystic19
23°C maximum daytime temperature in June in Mystic23
27°C maximum daytime temperature in July in Mystic27
26°C maximum daytime temperature in August in Mystic26
22°C maximum daytime temperature in September in Mystic22
17°C maximum daytime temperature in October in Mystic17
11°C maximum daytime temperature in November in Mystic11
5°C maximum daytime temperature in December in Mystic5
New Haven
2°C maximum daytime temperature in January in New Haven2
3°C maximum daytime temperature in February in New Haven3
8°C maximum daytime temperature in March in New Haven8
14°C maximum daytime temperature in April in New Haven14
19°C maximum daytime temperature in May in New Haven19
25°C maximum daytime temperature in June in New Haven25
27°C maximum daytime temperature in July in New Haven27
27°C maximum daytime temperature in August in New Haven27
23°C maximum daytime temperature in September in New Haven23
18°C maximum daytime temperature in October in New Haven18
12°C maximum daytime temperature in November in New Haven12
4°C maximum daytime temperature in December in New Haven4
Stamford
2°C maximum daytime temperature in January in Stamford2
4°C maximum daytime temperature in February in Stamford4
9°C maximum daytime temperature in March in Stamford9
15°C maximum daytime temperature in April in Stamford15
21°C maximum daytime temperature in May in Stamford21
26°C maximum daytime temperature in June in Stamford26
29°C maximum daytime temperature in July in Stamford29
28°C maximum daytime temperature in August in Stamford28
23°C maximum daytime temperature in September in Stamford23
18°C maximum daytime temperature in October in Stamford18
12°C maximum daytime temperature in November in Stamford12
5°C maximum daytime temperature in December in Stamford5

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Connecticut weather averages by month

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
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

Sunshine & UV index in Connecticut

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
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
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

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

Tropical storm risk: Connecticut hurricane season

% of month affected by tropical storms
0
0
0
0
0
0
0
1.2%
1.3%
0
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Compare Connecticut weather with the UK

The weather chart below compares the average monthly maximum daytime temperature for Connecticut, USA (Hartford) and the UK (London).

Maximum daytime temperature (°C)

Connecticut, USA (Hartford)
UK (London)
1
7
2
7
8
10
15
13
21
17
26
20
28
22
28
22
23
19
18
15
11
10
3
8
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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

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