Spa hotels — Třinec
Climate — Třinec: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 3°C | -4°C | 52 mm |
| February | 4°C | -3°C | 46 mm |
| March | 8°C | 0°C | 61 mm |
| April | 15°C | 4°C | 59 mm |
| May | 20°C | 8°C | 108 mm |
| June | 23°C | 12°C | 119 mm |
| July | 25°C | 14°C | 125 mm |
| August | 25°C | 13°C | 98 mm |
| September | 20°C | 9°C | 92 mm |
| October | 14°C | 6°C | 59 mm |
| November | 8°C | 2°C | 57 mm |
| December | 3°C | -3°C | 50 mm |
Averages from measurements at the Cieszyn station (10 km), years 1991–2020 — not a forecast. Data source: Institute of Meteorology and Water Management – National Research Institute (IMGW-PIB). IMGW-PIB data have been processed (long-term averages).