Groß-Gerau, Germany Climate
The warmest month is July, with an average high of 26°C; the coldest is January, with an average low of -2°C. A normal year brings 665 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 25
- Normal high
- 20°C
- Normal low
- 9°C
- Reanalysis high
- 27°Cin 1991
- Reanalysis low
- 3°Cin 2018
- Chance of a wet day
- 32%
- Daylight
- 12 h 01 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 3°C | -2°C | 13°C (1991) | -19°C (2002) | 56 mm | 12.4 |
| February | 5°C | -2°C | 17°C (2019) | -18°C (2012) | 42 mm | 11.3 |
| March | 10°C | 1°C | 22°C (1998) | -11°C (2005) | 47 mm | 9.3 |
| April | 15°C | 4°C | 28°C (2012) | -5°C (2003) | 42 mm | 9.0 |
| May | 20°C | 8°C | 32°C (2017) | -1°C (2020) | 65 mm | 12.4 |
| June | 24°C | 12°C | 38°C (2019) | 4°C (1991) | 57 mm | 12.0 |
| July | 26°C | 14°C | 40°C (2019) | 7°C (1993) | 68 mm | 12.4 |
| August | 26°C | 14°C | 40°C (2003) | 6°C (2014) | 59 mm | 12.4 |
| September | 22°C | 10°C | 33°C (2016) | 0°C (1995) | 51 mm | 9.0 |
| October | 15°C | 6°C | 27°C (2011) | -5°C (2003) | 56 mm | 12.4 |
| November | 8°C | 2°C | 21°C (2020) | -11°C (1998) | 57 mm | 12.0 |
| December | 4°C | -1°C | 14°C (2006) | -18°C (1996) | 65 mm | 12.4 |
| Year | 15°C | 5°C | 665 mm | 137 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
665 mm in a normal year, most in July.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Groß-Gerau.
The muggiest month is June, when 1 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | -1°C | 93% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | 0°C | 89% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | 2°C | 84% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | 5°C | 76% | 99% | 1% | 0% | 0% | 0% | 0% |
| May | 9°C | 73% | 88% | 10% | 2% | 0% | 0% | 0% |
| June | 11°C | 67% | 67% | 24% | 7% | 1% | 0% | 0% |
| July | 12°C | 62% | 58% | 29% | 13% | 0% | 0% | 0% |
| August | 12°C | 62% | 61% | 29% | 9% | 0% | 0% | 0% |
| September | 9°C | 70% | 86% | 12% | 1% | 0% | 0% | 0% |
| October | 7°C | 82% | 96% | 4% | 0% | 0% | 0% | 0% |
| November | 3°C | 91% | 100% | 0% | 0% | 0% | 0% | 0% |
| December | 0°C | 93% | 100% | 0% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is September, with the sky 68 percent covered on average; the cloudiest is November, at 79 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is January, averaging 15.8 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 20, with 16 h 22 min of daylight; the shortest is Dec 19, with 8 h 05 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Groß-Gerau in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.