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Bornheim, North Rhine-Westphalia climate
Cfb Oceanic / temperate
Bornheim has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 25°C, while the coldest is January averaging around 0°C at night. Precipitation is fairly even year-round, totalling about 572 mm. At latitude 51°N, day length swings from 7.8 hours in midwinter to 16.2 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 countsBornheim climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 11 | 16 | 19 | 23 | 25 | 25 | 20 | 15 | 10 | 6 |
| Avg temp (°C) | 3 | 4 | 7 | 10 | 14 | 17 | 19 | 19 | 15 | 11 | 7 | 4 |
| Avg low (°C) | 0 | 0 | 2 | 5 | 8 | 11 | 13 | 13 | 10 | 7 | 4 | 1 |
| Precipitation (mm) | 35 | 36 | 41 | 36 | 54 | 61 | 63 | 64 | 49 | 46 | 43 | 44 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 11 | 16 | 19 | 23 |
| Avg temp (°C) | 3 | 4 | 7 | 10 | 14 | 17 |
| Avg low (°C) | 0 | 0 | 2 | 5 | 8 | 11 |
| Precipitation (mm) | 35 | 36 | 41 | 36 | 54 | 61 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 20 | 15 | 10 | 6 |
| Avg temp (°C) | 19 | 19 | 15 | 11 | 7 | 4 |
| Avg low (°C) | 13 | 13 | 10 | 7 | 4 | 1 |
| Precipitation (mm) | 63 | 64 | 49 | 46 | 43 | 44 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 13 | 14 | 11 | 13 | 13 | 13 | 13 | 12 | 13 | 14 | 16 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.1 | 0.8 | 3 | 2 | 0.3 | — | — | — |
| Days with low ≤ 0°C (days) | 14 | 12 | 9 | 4 | 0.2 | — | — | — | 0.0 | 1 | 5 | 11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 13 | 14 | 11 | 13 | 13 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.1 | 0.8 |
| Days with low ≤ 0°C (days) | 14 | 12 | 9 | 4 | 0.2 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 13 | 12 | 13 | 14 | 16 |
| Days with high ≥ 32°C (days) | 3 | 2 | 0.3 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 0.0 | 1 | 5 | 11 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 74 | 73 | 70 | 72 | 72 | 70 | 68 | 67 | 72 | 78 | 77 |
| Clear days (≤ 30% cloud) | 3 | 3 | 4 | 4 | 4 | 3 | 3 | 4 | 5 | 3 | 2 | 2 |
| Partly cloudy days (30–70%) | 7 | 6 | 6 | 7 | 8 | 8 | 9 | 9 | 8 | 8 | 6 | 6 |
| Cloudy days (≥ 70%) | 21 | 19 | 21 | 19 | 20 | 19 | 19 | 18 | 17 | 20 | 22 | 23 |
| Relative humidity (%) | 94 | 92 | 87 | 81 | 79 | 77 | 71 | 71 | 77 | 86 | 93 | 95 |
| Wind speed (km/h) | 14.1 | 13.4 | 12.3 | 10.2 | 9.7 | 9.4 | 9.4 | 9.0 | 9.6 | 11.0 | 11.8 | 13.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 74 | 73 | 70 | 72 | 72 |
| Clear days (≤ 30% cloud) | 3 | 3 | 4 | 4 | 4 | 3 |
| Partly cloudy days (30–70%) | 7 | 6 | 6 | 7 | 8 | 8 |
| Cloudy days (≥ 70%) | 21 | 19 | 21 | 19 | 20 | 19 |
| Relative humidity (%) | 94 | 92 | 87 | 81 | 79 | 77 |
| Wind speed (km/h) | 14.1 | 13.4 | 12.3 | 10.2 | 9.7 | 9.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 68 | 67 | 72 | 78 | 77 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 3 | 2 | 2 |
| Partly cloudy days (30–70%) | 9 | 9 | 8 | 8 | 6 | 6 |
| Cloudy days (≥ 70%) | 19 | 18 | 17 | 20 | 22 | 23 |
| Relative humidity (%) | 71 | 71 | 77 | 86 | 93 | 95 |
| Wind speed (km/h) | 9.4 | 9.0 | 9.6 | 11.0 | 11.8 | 13.2 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Weilerswist-lommersum, a weather station, about 15 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.