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Dover, New Hampshire climate

Dfb Warm-summer humid continental

Dover has a strongly seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 81°F, while the coldest is January averaging around 15°F at night. Precipitation is fairly even year-round, totalling about 48 inches.

☀️ Summers

Warm

Highs near 81°F in July.

About 6 days a year above 90 °F

❄️ Winters

Very cold

Lows near 15°F in January.

About 142 freezing nights a year

🌧️ Rain

Wet

About 48 in of rain a year.

Wettest in October

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Dover climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	32	36	43	55	66	75	81	80	72	60	48	38
Avg temp (°F)	24	26	34	45	55	64	70	69	61	50	39	30
Avg low (°F)	15	16	25	34	44	53	59	57	50	39	30	22
Precipitation (in)	3.4	3.5	4.4	4.2	3.8	4.3	3.8	3.4	3.9	4.8	4.0	4.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	32	36	43	55	66	75
Avg temp (°F)	24	26	34	45	55	64
Avg low (°F)	15	16	25	34	44	53
Precipitation (in)	3.4	3.5	4.4	4.2	3.8	4.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	81	80	72	60	48	38
Avg temp (°F)	70	69	61	50	39	30
Avg low (°F)	59	57	50	39	30	22
Precipitation (in)	3.8	3.4	3.9	4.8	4.0	4.5

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	10	11	12	12	11	11	10	8	10	10	12
Days with high ≥ 90°F (days)	—	—	—	0.1	0.3	1	2	2	0.6	—	—	—
Days with low ≤ 32°F (days)	28	26	24	12	1	—	—	—	0.1	6	18	27

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	10	11	12	12	11
Days with high ≥ 90°F (days)	—	—	—	0.1	0.3	1
Days with low ≤ 32°F (days)	28	26	24	12	1	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	10	8	10	10	12
Days with high ≥ 90°F (days)	2	2	0.6	—	—	—
Days with low ≤ 32°F (days)	—	—	0.1	6	18	27

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	66	64	63	63	66	64	57	54	54	60	63	64
Clear days (≤ 30% cloud)	3	4	6	6	5	5	7	8	9	7	5	5
Partly cloudy days (30–70%)	12	11	11	10	11	11	13	12	10	10	10	12
Cloudy days (≥ 70%)	15	13	15	14	16	14	12	11	11	14	14	15
Relative humidity (%)	86	84	82	82	84	85	83	81	80	79	80	83
Wind speed (mph)	9.3	9.2	8.2	6.4	5.1	4.5	4.0	4.4	5.5	7.0	7.8	8.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	66	64	63	63	66	64
Clear days (≤ 30% cloud)	3	4	6	6	5	5
Partly cloudy days (30–70%)	12	11	11	10	11	11
Cloudy days (≥ 70%)	15	13	15	14	16	14
Relative humidity (%)	86	84	82	82	84	85
Wind speed (mph)	9.3	9.2	8.2	6.4	5.1	4.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	54	54	60	63	64
Clear days (≤ 30% cloud)	7	8	9	7	5	5
Partly cloudy days (30–70%)	13	12	10	10	10	12
Cloudy days (≥ 70%)	12	11	11	14	14	15
Relative humidity (%)	83	81	80	79	80	83
Wind speed (mph)	4.0	4.4	5.5	7.0	7.8	8.8

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Durham 2 N (NOAA GHCN station USW00054794), about 5 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →