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Saint John, New Brunswick climate

Dfb Warm-summer humid continental

Saint John has a strongly seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 26°C, while the coldest is January averaging around −13°C at night. Precipitation is fairly even year-round, totalling about 975 mm.

☀️ Summers

Warm

Highs near 26°C in July.

❄️ Winters

Very cold

Lows near −13°C in January.

🌧️ Rain

Moderate rainfall

About 975 mm of rain a year.

Wettest in October

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 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)

Saint John climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	−4	−2	3	10	18	22	26	25	21	14	7	0
Avg temp (°C)	−9	−7	−2	5	11	16	19	19	15	8	2	−4
Avg low (°C)	−13	−12	−7	−1	4	10	13	12	8	2	−2	−9
Precipitation (mm)	61	65	70	79	79	91	80	81	77	100	97	95

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	−4	−2	3	10	18	22
Avg temp (°C)	−9	−7	−2	5	11	16
Avg low (°C)	−13	−12	−7	−1	4	10
Precipitation (mm)	61	65	70	79	79	91

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	26	25	21	14	7	0
Avg temp (°C)	19	19	15	8	2	−4
Avg low (°C)	13	12	8	2	−2	−9
Precipitation (mm)	80	81	77	100	97	95

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	67	65	64	67	70	68	64	59	59	65	70	67
Relative humidity (%)	92	94	87	80	80	81	83	83	83	85	87	90
Wind speed (m/s)	0.5	0.6	0.8	0.8	0.6	0.6	0.6	0.6	0.6	0.6	0.5	0.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	67	65	64	67	70	68
Relative humidity (%)	92	94	87	80	80	81
Wind speed (m/s)	0.5	0.6	0.8	0.8	0.6	0.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	64	59	59	65	70	67
Relative humidity (%)	83	83	83	85	87	90
Wind speed (m/s)	0.6	0.6	0.6	0.6	0.5	0.4

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 17 years of daily observations at Gagetown Awos A, a weather station, about 70 km from the city centre. The underlying daily records come from NOAA's global station network.

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 →