WEATHER · CLIMATE NORMALS · 1991–2020
Tallinn Climate — Averages by Month
What the weather in Tallinn, EEaverages 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 | -3.0 °C | 52.6 mm |
| February | -3.9 °C · coldest | 42.8 mm |
| March | -0.8 °C | 38.5 mm |
| April | 4.4 °C | 40.7 mm |
| May | 9.8 °C | 45.0 mm |
| June | 14.2 °C | 74.4 mm |
| July | 17.8 °C · warmest | 73.8 mm |
| August | 16.9 °C | 84.0 mm · wettest |
| September | 12.4 °C | 67.4 mm |
| October | 7.0 °C | 73.1 mm |
| November | 2.5 °C | 60.3 mm |
| December | -0.6 °C | 57.9 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 Tallinn — centred at 59.50°N, 24.75°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.