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Hennef (Sieg), North Rhine-Westphalia climate
Cfb Oceanic / temperate
Hennef (Sieg) has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 77°F, while the coldest is January averaging around 32°F at night. Precipitation is fairly even year-round, totalling about 32 inches. 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 countsHennef (Sieg) climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 43 | 45 | 53 | 61 | 67 | 73 | 77 | 76 | 69 | 59 | 50 | 44 |
| Avg temp (°F) | 37 | 39 | 44 | 50 | 57 | 62 | 66 | 66 | 59 | 52 | 44 | 39 |
| Avg low (°F) | 32 | 32 | 36 | 40 | 46 | 52 | 56 | 55 | 50 | 44 | 38 | 34 |
| Precipitation (in) | 2.4 | 2.1 | 2.2 | 1.9 | 2.4 | 3.4 | 3.4 | 3.3 | 2.6 | 2.5 | 2.5 | 2.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 43 | 45 | 53 | 61 | 67 | 73 |
| Avg temp (°F) | 37 | 39 | 44 | 50 | 57 | 62 |
| Avg low (°F) | 32 | 32 | 36 | 40 | 46 | 52 |
| Precipitation (in) | 2.4 | 2.1 | 2.2 | 1.9 | 2.4 | 3.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 77 | 76 | 69 | 59 | 50 | 44 |
| Avg temp (°F) | 66 | 66 | 59 | 52 | 44 | 39 |
| Avg low (°F) | 56 | 55 | 50 | 44 | 38 | 34 |
| Precipitation (in) | 3.4 | 3.3 | 2.6 | 2.5 | 2.5 | 2.7 |
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 | 15 | 12 | 13 | 14 | 15 | 14 | 13 | 14 | 16 | 18 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.1 | 0.8 | 2 | 2 | 0.2 | — | — | — |
| Days with low ≤ 32°F (days) | 14 | 14 | 11 | 5 | 0.7 | — | — | — | 0.1 | 2 | 6 | 13 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 15 | 15 | 12 | 13 | 14 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.1 | 0.8 |
| Days with low ≤ 32°F (days) | 14 | 14 | 11 | 5 | 0.7 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 15 | 14 | 13 | 14 | 16 | 18 |
| Days with high ≥ 90°F (days) | 2 | 2 | 0.2 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 0.1 | 2 | 6 | 13 |
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 (%) | 92 | 89 | 84 | 79 | 77 | 74 | 70 | 69 | 75 | 84 | 91 | 93 |
| Wind speed (mph) | 8.3 | 7.9 | 7.3 | 6.1 | 5.8 | 5.6 | 5.6 | 5.5 | 5.8 | 6.6 | 7.0 | 7.6 |
| 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 (%) | 92 | 89 | 84 | 79 | 77 | 74 |
| Wind speed (mph) | 8.3 | 7.9 | 7.3 | 6.1 | 5.8 | 5.6 |
| 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 (%) | 70 | 69 | 75 | 84 | 91 | 93 |
| Wind speed (mph) | 5.6 | 5.5 | 5.8 | 6.6 | 7.0 | 7.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Koln-bonn, a weather station, about 13 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.