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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 78°F, while the coldest is January averaging around 8°F at night. Precipitation is fairly even year-round, totalling about 38 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours 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 (°F) | 26 | 29 | 38 | 50 | 64 | 72 | 78 | 77 | 70 | 56 | 44 | 32 |
| Avg temp (°F) | 17 | 19 | 28 | 40 | 52 | 61 | 67 | 66 | 58 | 46 | 36 | 24 |
| Avg low (°F) | 8 | 10 | 19 | 30 | 40 | 49 | 56 | 54 | 46 | 36 | 28 | 16 |
| Precipitation (in) | 2.4 | 2.5 | 2.8 | 3.1 | 3.1 | 3.6 | 3.1 | 3.2 | 3.0 | 3.9 | 3.8 | 3.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 26 | 29 | 38 | 50 | 64 | 72 |
| Avg temp (°F) | 17 | 19 | 28 | 40 | 52 | 61 |
| Avg low (°F) | 8 | 10 | 19 | 30 | 40 | 49 |
| Precipitation (in) | 2.4 | 2.5 | 2.8 | 3.1 | 3.1 | 3.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 78 | 77 | 70 | 56 | 44 | 32 |
| Avg temp (°F) | 67 | 66 | 58 | 46 | 36 | 24 |
| Avg low (°F) | 56 | 54 | 46 | 36 | 28 | 16 |
| Precipitation (in) | 3.1 | 3.2 | 3.0 | 3.9 | 3.8 | 3.7 |
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 (mph) | 1.1 | 1.4 | 1.8 | 1.7 | 1.4 | 1.3 | 1.3 | 1.3 | 1.4 | 1.4 | 1.2 | 1.0 |
| 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 (mph) | 1.1 | 1.4 | 1.8 | 1.7 | 1.4 | 1.3 |
| 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 (mph) | 1.3 | 1.3 | 1.4 | 1.4 | 1.2 | 1.0 |
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.