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Sundsvall, Sweden climate
Dfb Warm-summer humid continental
Sundsvall has a seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 70°F, while the coldest is January averaging around 14°F at night. Around 22 inches of precipitation falls each year, peaking in August (3.0 inches) and easing off in February (0.9 inches). At latitude 63°N, day length swings from 4.5 hours in midwinter to 19.5 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsSundsvall climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 28 | 30 | 38 | 47 | 57 | 65 | 70 | 68 | 59 | 47 | 36 | 30 |
| Avg temp (°F) | 21 | 22 | 29 | 38 | 47 | 56 | 61 | 59 | 51 | 40 | 31 | 24 |
| Avg low (°F) | 14 | 13 | 21 | 29 | 37 | 46 | 53 | 51 | 43 | 33 | 26 | 18 |
| Precipitation (in) | 1.5 | 0.9 | 1.0 | 1.5 | 1.3 | 2.2 | 2.6 | 3.0 | 1.9 | 2.2 | 2.1 | 1.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 28 | 30 | 38 | 47 | 57 | 65 |
| Avg temp (°F) | 21 | 22 | 29 | 38 | 47 | 56 |
| Avg low (°F) | 14 | 13 | 21 | 29 | 37 | 46 |
| Precipitation (in) | 1.5 | 0.9 | 1.0 | 1.5 | 1.3 | 2.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 70 | 68 | 59 | 47 | 36 | 30 |
| Avg temp (°F) | 61 | 59 | 51 | 40 | 31 | 24 |
| Avg low (°F) | 53 | 51 | 43 | 33 | 26 | 18 |
| Precipitation (in) | 2.6 | 3.0 | 1.9 | 2.2 | 2.1 | 1.5 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 5 | 5 | 5 | 5 | 7 | 7 | 6 | 6 | 7 | 7 | 7 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | — | 0.1 | — | — | — | — | — |
| Days with low ≤ 32°F (days) | 30 | 27 | 29 | 23 | 8 | 0.1 | — | — | 2 | 14 | 25 | 29 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 5 | 5 | 5 | 5 | 7 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | — |
| Days with low ≤ 32°F (days) | 30 | 27 | 29 | 23 | 8 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 6 | 6 | 7 | 7 | 7 |
| Days with high ≥ 90°F (days) | 0.1 | — | — | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 2 | 14 | 25 | 29 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 70 | 64 | 64 | 67 | 66 | 67 | 66 | 67 | 69 | 71 | 70 |
| Clear days (≤ 30% cloud) | 3 | 3 | 4 | 4 | 4 | 3 | 3 | 4 | 4 | 4 | 3 | 3 |
| Partly cloudy days (30–70%) | 9 | 10 | 12 | 11 | 11 | 12 | 11 | 11 | 10 | 10 | 10 | 11 |
| Cloudy days (≥ 70%) | 19 | 16 | 15 | 14 | 17 | 15 | 16 | 16 | 16 | 18 | 17 | 18 |
| Relative humidity (%) | 98 | 98 | 94 | 84 | 80 | 79 | 81 | 85 | 88 | 92 | 96 | 98 |
| Wind speed (mph) | 2.8 | 2.6 | 2.4 | 2.1 | 1.8 | 1.9 | 2.0 | 2.3 | 2.6 | 2.7 | 2.7 | 2.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 70 | 64 | 64 | 67 | 66 |
| Clear days (≤ 30% cloud) | 3 | 3 | 4 | 4 | 4 | 3 |
| Partly cloudy days (30–70%) | 9 | 10 | 12 | 11 | 11 | 12 |
| Cloudy days (≥ 70%) | 19 | 16 | 15 | 14 | 17 | 15 |
| Relative humidity (%) | 98 | 98 | 94 | 84 | 80 | 79 |
| Wind speed (mph) | 2.8 | 2.6 | 2.4 | 2.1 | 1.8 | 1.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 66 | 67 | 69 | 71 | 70 |
| Clear days (≤ 30% cloud) | 3 | 4 | 4 | 4 | 3 | 3 |
| Partly cloudy days (30–70%) | 11 | 11 | 10 | 10 | 10 | 11 |
| Cloudy days (≥ 70%) | 16 | 16 | 16 | 18 | 17 | 18 |
| Relative humidity (%) | 81 | 85 | 88 | 92 | 96 | 98 |
| Wind speed (mph) | 2.0 | 2.3 | 2.6 | 2.7 | 2.7 | 2.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Sundsvalls Flygplats, a weather station, about 16 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.