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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 27°C, while the coldest is January averaging around −10°C at night. Precipitation is fairly even year-round, totalling about 1215 mm.

☀️ Summers

Warm

Highs near 27°C in July.

About 6 days a year above 32 °C

❄️ Winters

Very cold

Lows near −10°C in January.

About 142 freezing nights a year

🌧️ Rain

Wet

About 1215 mm 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 (°C)	0	2	6	13	19	24	27	27	22	16	9	3
Avg temp (°C)	−5	−3	1	7	13	18	21	20	16	10	4	−1
Avg low (°C)	−10	−9	−4	1	7	12	15	14	10	4	−1	−6
Precipitation (mm)	86	89	112	107	97	109	96	87	98	122	100	114

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	0	2	6	13	19	24
Avg temp (°C)	−5	−3	1	7	13	18
Avg low (°C)	−10	−9	−4	1	7	12
Precipitation (mm)	86	89	112	107	97	109

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	27	27	22	16	9	3
Avg temp (°C)	21	20	16	10	4	−1
Avg low (°C)	15	14	10	4	−1	−6
Precipitation (mm)	96	87	98	122	100	114

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 ≥ 32°C (days)	—	—	—	0.1	0.3	1	2	2	0.6	—	—	—
Days with low ≤ 0°C (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 ≥ 32°C (days)	—	—	—	0.1	0.3	1
Days with low ≤ 0°C (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 ≥ 32°C (days)	2	2	0.6	—	—	—
Days with low ≤ 0°C (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 (km/h)	14.9	14.8	13.2	10.2	8.2	7.2	6.5	7.0	8.8	11.2	12.6	14.2

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 (km/h)	14.9	14.8	13.2	10.2	8.2	7.2

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 (km/h)	6.5	7.0	8.8	11.2	12.6	14.2

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 →