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Newark, Delaware climate

Cfa Humid subtropical

Newark has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 89°F, while the coldest is January averaging around 25°F at night. Precipitation is fairly even year-round, totalling about 47 inches.

☀️ Summers

Hot

Highs near 89°F in July.

About 25 days a year above 90 °F

❄️ Winters

Cold

Lows near 25°F in January.

About 78 freezing nights a year

🌧️ Rain

Wet

About 47 in of rain a year.

Wettest in September

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.8 °F vs 50 years ago

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

Newark climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	43	46	54	67	76	84	89	87	79	69	57	47
Avg temp (°F)	34	36	44	55	64	73	78	76	69	58	46	38
Avg low (°F)	25	25	33	42	52	62	66	65	58	46	36	30
Precipitation (in)	3.4	2.9	4.3	3.7	3.6	4.0	4.8	4.0	4.9	4.0	3.4	4.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	43	46	54	67	76	84
Avg temp (°F)	34	36	44	55	64	73
Avg low (°F)	25	25	33	42	52	62
Precipitation (in)	3.4	2.9	4.3	3.7	3.6	4.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	89	87	79	69	57	47
Avg temp (°F)	78	76	69	58	46	38
Avg low (°F)	66	65	58	46	36	30
Precipitation (in)	4.8	4.0	4.9	4.0	3.4	4.0

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	7	9	9	10	6	8	6	8	7	6	9
Days with high ≥ 90°F (days)	—	—	—	0.2	2	4	11	6	2	0.1	—	—
Days with low ≤ 32°F (days)	20	16	12	3	—	—	—	—	—	0.8	8	18
Days with snowfall ≥ 1 in (days)	0.6	0.5	0.2	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	8	7	9	9	10	6
Days with high ≥ 90°F (days)	—	—	—	0.2	2	4
Days with low ≤ 32°F (days)	20	16	12	3	—	—
Days with snowfall ≥ 1 in (days)	0.6	0.5	0.2	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	6	8	7	6	9
Days with high ≥ 90°F (days)	11	6	2	0.1	—	—
Days with low ≤ 32°F (days)	—	—	—	0.8	8	18
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	62	62	62	62	62	59	55	54	54	54	59	63
Clear days (≤ 30% cloud)	5	5	6	6	5	6	7	8	9	10	7	5
Partly cloudy days (30–70%)	11	10	11	9	12	12	13	12	10	10	11	11
Cloudy days (≥ 70%)	14	13	15	15	14	12	11	11	11	12	12	15
Relative humidity (%)	84	83	81	78	79	76	71	72	74	77	80	84
Wind speed (mph)	7.0	7.1	7.3	6.8	5.6	5.1	4.6	4.5	5.1	5.7	6.0	6.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	62	62	62	62	62	59
Clear days (≤ 30% cloud)	5	5	6	6	5	6
Partly cloudy days (30–70%)	11	10	11	9	12	12
Cloudy days (≥ 70%)	14	13	15	15	14	12
Relative humidity (%)	84	83	81	78	79	76
Wind speed (mph)	7.0	7.1	7.3	6.8	5.6	5.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	55	54	54	54	59	63
Clear days (≤ 30% cloud)	7	8	9	10	7	5
Partly cloudy days (30–70%)	13	12	10	10	11	11
Cloudy days (≥ 70%)	11	11	11	12	12	15
Relative humidity (%)	71	72	74	77	80	84
Wind speed (mph)	4.6	4.5	5.1	5.7	6.0	6.3

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Newark AG Farm (NOAA GHCN station USC00076410), about 2 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 →