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Heerlen, Netherlands climate
Cfb Oceanic / temperate
Heerlen has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 24°C, while the coldest is January averaging around 1°C at night. Around 757 mm of precipitation falls each year, peaking in August (83 mm) and easing off in April (41 mm). At latitude 51°N, day length swings from 7.7 hours in midwinter to 16.3 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 countsHeerlen climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 11 | 15 | 19 | 22 | 24 | 24 | 20 | 15 | 10 | 6 |
| Avg temp (°C) | 3 | 4 | 7 | 10 | 14 | 17 | 19 | 18 | 15 | 11 | 7 | 4 |
| Avg low (°C) | 1 | 1 | 3 | 5 | 9 | 12 | 14 | 13 | 11 | 7 | 4 | 1 |
| Precipitation (mm) | 64 | 58 | 54 | 41 | 58 | 69 | 73 | 83 | 57 | 64 | 62 | 74 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 11 | 15 | 19 | 22 |
| Avg temp (°C) | 3 | 4 | 7 | 10 | 14 | 17 |
| Avg low (°C) | 1 | 1 | 3 | 5 | 9 | 12 |
| Precipitation (mm) | 64 | 58 | 54 | 41 | 58 | 69 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 24 | 24 | 20 | 15 | 10 | 6 |
| Avg temp (°C) | 19 | 18 | 15 | 11 | 7 | 4 |
| Avg low (°C) | 14 | 13 | 11 | 7 | 4 | 1 |
| Precipitation (mm) | 73 | 83 | 57 | 64 | 62 | 74 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 15 | 14 | 12 | 13 | 13 | 13 | 14 | 12 | 14 | 16 | 18 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.1 | 0.6 | 2 | 1 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | 14 | 13 | 8 | 3 | 0.0 | — | — | — | — | 1 | 6 | 12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 15 | 14 | 12 | 13 | 13 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.1 | 0.6 |
| Days with low ≤ 0°C (days) | 14 | 13 | 8 | 3 | 0.0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 14 | 12 | 14 | 16 | 18 |
| Days with high ≥ 32°C (days) | 2 | 1 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 1 | 6 | 12 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 72 | 71 | 68 | 70 | 71 | 68 | 67 | 66 | 71 | 75 | 74 |
| Clear days (≤ 30% cloud) | 3 | 3 | 4 | 4 | 4 | 3 | 4 | 4 | 5 | 3 | 2 | 3 |
| Partly cloudy days (30–70%) | 8 | 7 | 7 | 9 | 8 | 9 | 10 | 10 | 9 | 9 | 8 | 7 |
| Cloudy days (≥ 70%) | 20 | 19 | 20 | 17 | 19 | 19 | 18 | 17 | 16 | 19 | 20 | 21 |
| Relative humidity (%) | 92 | 89 | 83 | 77 | 75 | 74 | 72 | 73 | 77 | 84 | 91 | 93 |
| Wind speed (m/s) | 3.8 | 3.7 | 3.4 | 2.9 | 2.8 | 2.7 | 2.6 | 2.5 | 2.7 | 3.1 | 3.2 | 3.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 72 | 71 | 68 | 70 | 71 |
| Clear days (≤ 30% cloud) | 3 | 3 | 4 | 4 | 4 | 3 |
| Partly cloudy days (30–70%) | 8 | 7 | 7 | 9 | 8 | 9 |
| Cloudy days (≥ 70%) | 20 | 19 | 20 | 17 | 19 | 19 |
| Relative humidity (%) | 92 | 89 | 83 | 77 | 75 | 74 |
| Wind speed (m/s) | 3.8 | 3.7 | 3.4 | 2.9 | 2.8 | 2.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 67 | 66 | 71 | 75 | 74 |
| Clear days (≤ 30% cloud) | 4 | 4 | 5 | 3 | 2 | 3 |
| Partly cloudy days (30–70%) | 10 | 10 | 9 | 9 | 8 | 7 |
| Cloudy days (≥ 70%) | 18 | 17 | 16 | 19 | 20 | 21 |
| Relative humidity (%) | 72 | 73 | 77 | 84 | 91 | 93 |
| Wind speed (m/s) | 2.6 | 2.5 | 2.7 | 3.1 | 3.2 | 3.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Maastricht, 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.