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Clayton, New Jersey climate

Cfa Humid subtropical

Clayton 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 1279 mm. Light snow accumulates each winter (60 cm of snow per year on average).

☀️ Summers

Warm

Highs near 30°C in July.

About 28 days a year above 32 °C

❄️ Winters

Cold

Lows near −5°C in January.

About 110 freezing nights a year

🌧️ Rain & snow

Wet

About 1279 mm of rain a year, plus 60 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.2 °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

Clayton climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	6	7	12	18	24	28	30	29	26	20	14	8
Avg temp (°C)	0	2	6	12	17	21	24	23	19	13	7	3
Avg low (°C)	−5	−4	−1	5	10	15	18	17	13	7	1	−2
Precipitation (mm)	93	76	114	93	96	110	133	136	113	110	88	116
Snowfall (cm)	15	23	10	1	—	—	—	—	—	—	1	10

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	6	7	12	18	24	28
Avg temp (°C)	0	2	6	12	17	21
Avg low (°C)	−5	−4	−1	5	10	15
Precipitation (mm)	93	76	114	93	96	110
Snowfall (cm)	15	23	10	1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	30	29	26	20	14	8
Avg temp (°C)	24	23	19	13	7	3
Avg low (°C)	18	17	13	7	1	−2
Precipitation (mm)	133	136	113	110	88	116
Snowfall (cm)	—	—	—	—	1	10

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	8	8	8	9	8	9	8	7	7	7	9
Days with high ≥ 32°C (days)	—	—	0.0	0.3	2	6	11	7	2	0.1	—	—
Days with low ≤ 0°C (days)	24	22	18	7	0.8	—	—	—	—	4	14	20
Days with snowfall ≥ 2.5 cm (days)	2	2	0.9	0.1	—	—	—	—	—	—	0.1	0.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	8	8	8	8	9	8
Days with high ≥ 32°C (days)	—	—	0.0	0.3	2	6
Days with low ≤ 0°C (days)	24	22	18	7	0.8	—
Days with snowfall ≥ 2.5 cm (days)	2	2	0.9	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	8	7	7	7	9
Days with high ≥ 32°C (days)	11	7	2	0.1	—	—
Days with low ≤ 0°C (days)	—	—	—	4	14	20
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	0.1	0.9

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	63	62	61	61	61	58	55	53	53	54	59	63
Clear days (≤ 30% cloud)	5	5	6	6	6	6	7	8	9	9	7	5
Partly cloudy days (30–70%)	11	10	11	10	12	12	12	12	10	10	11	11
Cloudy days (≥ 70%)	14	13	14	14	14	12	11	11	11	12	12	14
Relative humidity (%)	84	83	81	78	79	78	73	73	74	77	80	84
Wind speed (km/h)	8.3	8.7	9.0	8.2	6.7	6.0	5.5	5.3	5.9	6.5	6.8	7.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	63	62	61	61	61	58
Clear days (≤ 30% cloud)	5	5	6	6	6	6
Partly cloudy days (30–70%)	11	10	11	10	12	12
Cloudy days (≥ 70%)	14	13	14	14	14	12
Relative humidity (%)	84	83	81	78	79	78
Wind speed (km/h)	8.3	8.7	9.0	8.2	6.7	6.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	55	53	53	54	59	63
Clear days (≤ 30% cloud)	7	8	9	9	7	5
Partly cloudy days (30–70%)	12	12	10	10	11	11
Cloudy days (≥ 70%)	11	11	11	12	12	14
Relative humidity (%)	73	73	74	77	80	84
Wind speed (km/h)	5.5	5.3	5.9	6.5	6.8	7.2

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Indian Mills 2 W (NOAA GHCN station USC00284229), about 31 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 →