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Randolph, New Jersey climate

Cfa Humid subtropical

Randolph 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 −4°C at night. Precipitation is fairly even year-round, totalling about 1280 mm. Winters bring significant snowfall (67 cm of snow per year on average).

☀️ Summers

Warm

Highs near 30°C in July.

About 26 days a year above 32 °C

❄️ Winters

Cold

Lows near −4°C in January.

About 105 freezing nights a year

🌧️ Rain & snow

Wet

About 1280 mm of rain a year, plus 67 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.9 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 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

Randolph climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	5	6	10	17	22	27	30	29	25	19	13	7
Avg temp (°C)	0	2	6	11	17	22	25	24	20	13	8	3
Avg low (°C)	−4	−3	1	6	11	17	20	19	15	8	3	−1
Precipitation (mm)	95	83	112	103	107	115	135	105	108	112	92	114
Snowfall (cm)	18	21	13	1	—	—	—	—	—	—	0	14

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	5	6	10	17	22	27
Avg temp (°C)	0	2	6	11	17	22
Avg low (°C)	−4	−3	1	6	11	17
Precipitation (mm)	95	83	112	103	107	115
Snowfall (cm)	18	21	13	1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	30	29	25	19	13	7
Avg temp (°C)	25	24	20	13	8	3
Avg low (°C)	20	19	15	8	3	−1
Precipitation (mm)	135	105	108	112	92	114
Snowfall (cm)	—	—	—	—	0	14

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	11	11	10	9	8	9	8	9
Days with high ≥ 32°C (days)	—	—	0.0	0.4	2	5	10	7	2	—	—	—
Days with low ≤ 0°C (days)	26	23	18	5	0.2	—	—	0.0	—	2	11	19
Days with snowfall ≥ 2.5 cm (days)	2	2	1	0.1	—	—	—	—	—	0.0	0.1	1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	8	9	11	11	11
Days with high ≥ 32°C (days)	—	—	0.0	0.4	2	5
Days with low ≤ 0°C (days)	26	23	18	5	0.2	—
Days with snowfall ≥ 2.5 cm (days)	2	2	1	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	9	8	9	8	9
Days with high ≥ 32°C (days)	10	7	2	—	—	—
Days with low ≤ 0°C (days)	—	0.0	—	2	11	19
Days with snowfall ≥ 2.5 cm (days)	—	—	—	0.0	0.1	1

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 (m/s)	2.0	2.0	1.9	1.5	1.2	1.1	1.0	1.1	1.2	1.4	1.5	1.7

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 (m/s)	2.0	2.0	1.9	1.5	1.2	1.1

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 (m/s)	1.0	1.1	1.2	1.4	1.5	1.7

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Cranford (NOAA GHCN station USC00282023), about 30 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 →