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Caribou, Maine climate

Dfb Warm-summer humid continental

Caribou has a strongly seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 25°C, while the coldest is January averaging around −16°C at night. Precipitation is fairly even year-round, totalling about 1034 mm. Snowfall is heavy (300 cm of snow per year on average).

☀️ Summers

Mild

Highs near 25°C in July.

About 2 days a year above 32 °C

❄️ Winters

Bitterly cold

Lows near −16°C in January.

About 180 freezing nights a year

🌧️ Rain & snow

Wet

About 1034 mm of rain a year, plus 300 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+0.8 °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

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Caribou climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	−6	−4	1	9	17	22	25	24	20	12	4	−3
Avg temp (°C)	−11	−10	−4	4	11	16	19	18	14	7	0	−7
Avg low (°C)	−16	−15	−9	−1	5	10	14	12	8	2	−4	−11
Precipitation (mm)	75	61	70	76	88	99	107	92	87	101	85	91
Snowfall (cm)	64	64	54	21	2	—	—	—	0	4	26	64

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	−6	−4	1	9	17	22
Avg temp (°C)	−11	−10	−4	4	11	16
Avg low (°C)	−16	−15	−9	−1	5	10
Precipitation (mm)	75	61	70	76	88	99
Snowfall (cm)	64	64	54	21	2	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	25	24	20	12	4	−3
Avg temp (°C)	19	18	14	7	0	−7
Avg low (°C)	14	12	8	2	−4	−11
Precipitation (mm)	107	92	87	101	85	91
Snowfall (cm)	—	—	0	4	26	64

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	14	12	13	13	15	14	14	13	12	14	13	15
Days with high ≥ 32°C (days)	—	—	—	—	0.2	0.5	0.7	0.5	0.1	—	—	—
Days with low ≤ 0°C (days)	30	28	29	21	4	0.1	—	—	2	12	24	30
Days with snowfall ≥ 2.5 cm (days)	7	6	5	3	0.2	—	—	—	0.0	0.4	3	6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	14	12	13	13	15	14
Days with high ≥ 32°C (days)	—	—	—	—	0.2	0.5
Days with low ≤ 0°C (days)	30	28	29	21	4	0.1
Days with snowfall ≥ 2.5 cm (days)	7	6	5	3	0.2	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	14	13	12	14	13	15
Days with high ≥ 32°C (days)	0.7	0.5	0.1	—	—	—
Days with low ≤ 0°C (days)	—	—	2	12	24	30
Days with snowfall ≥ 2.5 cm (days)	—	—	0.0	0.4	3	6

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	66	64	64	66	71	68	64	61	61	69	72	69
Relative humidity (%)	97	96	94	85	81	82	84	84	84	86	89	95
Wind speed (m/s)	1.6	1.8	1.8	1.5	1.1	0.9	0.9	0.8	0.9	1.0	1.1	1.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	66	64	64	66	71	68
Relative humidity (%)	97	96	94	85	81	82
Wind speed (m/s)	1.6	1.8	1.8	1.5	1.1	0.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	64	61	61	69	72	69
Relative humidity (%)	84	84	84	86	89	95
Wind speed (m/s)	0.9	0.8	0.9	1.0	1.1	1.3

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Caribou Wfo (NOAA GHCN station USW00014607), about 1 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 →