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East Brunswick, New Jersey climate

Cfa Humid subtropical

East Brunswick has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 30°C, while the coldest is January averaging around −5°C at night. Precipitation is fairly even year-round, totalling about 1234 mm.

☀️ Summers

Warm

Highs near 30°C in July.

About 25 days a year above 32 °C

❄️ Winters

Cold

Lows near −5°C in January.

About 98 freezing nights a year

🌧️ Rain

Wet

About 1234 mm of rain a year.

Wettest in December

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.6 °C 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

East Brunswick climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	5	7	11	17	22	27	30	29	26	19	13	8
Avg temp (°C)	0	2	5	11	16	21	24	23	20	13	8	3
Avg low (°C)	−5	−4	0	5	10	16	19	17	13	7	2	−2
Precipitation (mm)	98	79	107	97	97	113	118	105	106	105	90	119

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	5	7	11	17	22	27
Avg temp (°C)	0	2	5	11	16	21
Avg low (°C)	−5	−4	0	5	10	16
Precipitation (mm)	98	79	107	97	97	113

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	30	29	26	19	13	8
Avg temp (°C)	24	23	20	13	8	3
Avg low (°C)	19	17	13	7	2	−2
Precipitation (mm)	118	105	106	105	90	119

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	8	9	11	12	11	9	10	9	9	9	10
Days with high ≥ 32°C (days)	—	—	—	0.3	1	5	10	7	2	0.0	—	—
Days with low ≤ 0°C (days)	24	21	15	4	0.1	—	—	—	—	2	11	21
Days with snowfall ≥ 2.5 cm (days)	1	2	1	0.1	—	—	—	—	—	0.0	—	0.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	8	9	11	12	11
Days with high ≥ 32°C (days)	—	—	—	0.3	1	5
Days with low ≤ 0°C (days)	24	21	15	4	0.1	—
Days with snowfall ≥ 2.5 cm (days)	1	2	1	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	10	9	9	9	10
Days with high ≥ 32°C (days)	10	7	2	0.0	—	—
Days with low ≤ 0°C (days)	—	—	—	2	11	21
Days with snowfall ≥ 2.5 cm (days)	—	—	—	0.0	—	0.8

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	63	61	63	63	65	61	57	55	55	56	60	63
Clear days (≤ 30% cloud)	5	5	6	6	5	6	7	8	8	8	6	5
Partly cloudy days (30–70%)	11	10	10	9	11	11	13	11	10	10	10	12
Cloudy days (≥ 70%)	15	13	15	15	15	13	12	12	12	13	13	14
Relative humidity (%)	85	84	82	79	79	77	72	73	73	77	80	85
Wind speed (km/h)	7.0	7.3	6.8	5.4	4.3	3.9	3.7	3.8	4.4	5.1	5.4	6.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	63	61	63	63	65	61
Clear days (≤ 30% cloud)	5	5	6	6	5	6
Partly cloudy days (30–70%)	11	10	10	9	11	11
Cloudy days (≥ 70%)	15	13	15	15	15	13
Relative humidity (%)	85	84	82	79	79	77
Wind speed (km/h)	7.0	7.3	6.8	5.4	4.3	3.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	55	55	56	60	63
Clear days (≤ 30% cloud)	7	8	8	8	6	5
Partly cloudy days (30–70%)	13	11	10	10	10	12
Cloudy days (≥ 70%)	12	12	12	13	13	14
Relative humidity (%)	72	73	73	77	80	85
Wind speed (km/h)	3.7	3.8	4.4	5.1	5.4	6.0

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Freehold-marlboro (NOAA GHCN station USC00283181), about 19 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 →