WEATHER · CLIMATE NORMALS · 1991–2020
Vienna Climate — Averages by Month
What the weather in Vienna, ATaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 0.2 °C · coldest | 40.6 mm |
| February | 1.7 °C | 36.6 mm |
| March | 5.7 °C | 52.0 mm |
| April | 10.8 °C | 49.3 mm |
| May | 15.2 °C | 77.0 mm |
| June | 18.9 °C | 81.3 mm |
| July | 20.8 °C · warmest | 83.3 mm · wettest |
| August | 20.5 °C | 75.3 mm |
| September | 15.5 °C | 74.5 mm |
| October | 10.2 °C | 51.5 mm |
| November | 5.3 °C | 48.3 mm |
| December | 1.0 °C | 44.0 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Vienna — centred at 48.25°N, 16.25°E. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.