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Randolph, Massachusetts 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 28°C, while the coldest is January averaging around −6°C at night. Precipitation is fairly even year-round, totalling about 1329 mm. Winters bring significant snowfall (129 cm of snow per year on average).

☀️ Summers

Warm

Highs near 28°C in July.

About 13 days a year above 32 °C

❄️ Winters

Cold

Lows near −6°C in January.

About 115 freezing nights a year

🌧️ Rain & snow

Wet

About 1329 mm of rain a year, plus 129 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.7 °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)	3	5	8	15	20	25	28	28	23	17	11	6
Avg temp (°C)	−1	0	3	9	15	20	23	22	18	12	7	2
Avg low (°C)	−6	−5	−2	4	9	14	17	17	13	7	2	−3
Precipitation (mm)	114	101	137	118	96	103	90	97	99	133	113	129
Snowfall (cm)	38	37	26	4	—	—	—	—	—	0	2	22

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	3	5	8	15	20	25
Avg temp (°C)	−1	0	3	9	15	20
Avg low (°C)	−6	−5	−2	4	9	14
Precipitation (mm)	114	101	137	118	96	103
Snowfall (cm)	38	37	26	4	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	28	28	23	17	11	6
Avg temp (°C)	23	22	18	12	7	2
Avg low (°C)	17	17	13	7	2	−3
Precipitation (mm)	90	97	99	133	113	129
Snowfall (cm)	—	—	—	0	2	22

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	13	11	12	12	13	11	10	9	9	11	11	12
Days with high ≥ 32°C (days)	—	—	—	0.1	0.8	2	6	4	0.7	—	—	—
Days with low ≤ 0°C (days)	26	24	20	7	0.4	—	—	—	—	2	13	23
Days with snowfall ≥ 2.5 cm (days)	3	3	2	0.3	—	—	—	—	—	0.0	0.2	2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	13	11	12	12	13	11
Days with high ≥ 32°C (days)	—	—	—	0.1	0.8	2
Days with low ≤ 0°C (days)	26	24	20	7	0.4	—
Days with snowfall ≥ 2.5 cm (days)	3	3	2	0.3	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	9	9	11	11	12
Days with high ≥ 32°C (days)	6	4	0.7	—	—	—
Days with low ≤ 0°C (days)	—	—	—	2	13	23
Days with snowfall ≥ 2.5 cm (days)	—	—	—	0.0	0.2	2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	69	66	64	62	64	61	55	51	52	57	65	68
Clear days (≤ 30% cloud)	3	4	5	6	5	6	7	9	10	8	5	4
Partly cloudy days (30–70%)	11	10	11	10	11	11	13	12	9	11	10	11
Cloudy days (≥ 70%)	17	14	15	14	15	13	11	10	11	13	15	16
Relative humidity (%)	85	83	82	82	82	82	78	78	78	79	81	83
Wind speed (mph)	8.1	8.0	7.5	6.0	5.0	4.5	4.2	4.4	5.3	6.4	7.0	7.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	69	66	64	62	64	61
Clear days (≤ 30% cloud)	3	4	5	6	5	6
Partly cloudy days (30–70%)	11	10	11	10	11	11
Cloudy days (≥ 70%)	17	14	15	14	15	13
Relative humidity (%)	85	83	82	82	82	82
Wind speed (mph)	8.1	8.0	7.5	6.0	5.0	4.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	55	51	52	57	65	68
Clear days (≤ 30% cloud)	7	9	10	8	5	4
Partly cloudy days (30–70%)	13	12	9	11	10	11
Cloudy days (≥ 70%)	11	10	11	13	15	16
Relative humidity (%)	78	78	78	79	81	83
Wind speed (mph)	4.2	4.4	5.3	6.4	7.0	7.7

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Hingham (NOAA GHCN station USC00193624), about 13 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 →