St Petersburg experiences a maritime climate similar to the Baltic nations, having lighter winters and slightly cooler summers than other regions of Russia further east and inland. The real climatic culprit is the chilly Gulf of Finland wind, which makes a warm hat and scarf a necessity.
| Month | Temp (°C) | Rainfall (mm) | Humidity (%) | Sunshine (hours) |
| Jan | -13 - -7 | 35 | 0 | |
| Feb | -12 - -5 | 30 | 2 | |
| Mar | -8 - 0 | 31 | 4 | |
| Apr | 0 - 8 | 36 | 5 | |
| May | 6 - 15 | 46 | 8 | |
| Jun | 11 - 20 | 50 | 10 | |
| Jul | 13 - 21 | 72 | 9 | |
| Aug | 13 - 20 | 78 | 8 | |
| Sep | 9 - 15 | 64 | 5 | |
| Oct | 4 - 9 | 76 | 2 | |
| Nov | -2 - 2 | 46 | 1 | |
| Dec | -8 - -3 | 40 | 0 |