| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -6.1° | -11.9° | 37.9mm | 18.9 | 0 |
| February | -5.4° | -11.7° | 30.2mm | 16.4 | 0 |
| March | -0.1° | -7.1° | 30.9mm | 13.4 | 5 |
| April | 6.7° | -1.3° | 32.8mm | 10.6 | 31 |
| May | 13.8° | 4.2° | 49.1mm | 11.8 | 57 |
| June | 18.8° | 9.4° | 59.6mm | 12.5 | 71 |
| July | 21.9° | 13° | 86.5mm | 14.7 | 71 |
| August | 19.5° | 11.3° | 82.9mm | 13.3 | 72 |
| September | 13.8° | 6.9° | 59.3mm | 13.8 | 53 |
| October | 6.5° | 1.7° | 57.6mm | 16.2 | 26 |
| November | 0.3° | -3.9° | 54mm | 18.4 | 6 |
| December | -3.5° | -8.5° | 45.2mm | 19.8 | 0 |
January in Petrozavodsk averages a daily high of -6.1°C with nights around -11.9°C. Expect roughly 18.9 wet days totalling 37.9mm. A hard month to visit for comfort alone.
February in Petrozavodsk averages a daily high of -5.4°C with nights around -11.7°C. Expect roughly 16.4 wet days totalling 30.2mm. A hard month to visit for comfort alone.
March in Petrozavodsk averages a daily high of -0.1°C with nights around -7.1°C. Expect roughly 13.4 wet days totalling 30.9mm. A hard month to visit for comfort alone.
April in Petrozavodsk averages a daily high of 6.7°C with nights around -1.3°C. Expect roughly 10.6 wet days totalling 32.8mm. A hard month to visit for comfort alone.
May in Petrozavodsk averages a daily high of 13.8°C with nights around 4.2°C. Expect roughly 11.8 wet days totalling 49.1mm. Generally workable, with some weather to plan around.
June in Petrozavodsk averages a daily high of 18.8°C with nights around 9.4°C. Expect roughly 12.5 wet days totalling 59.6mm. Generally workable, with some weather to plan around.
July in Petrozavodsk averages a daily high of 21.9°C with nights around 13°C. Expect roughly 14.7 wet days totalling 86.5mm. Generally workable, with some weather to plan around.
August in Petrozavodsk averages a daily high of 19.5°C with nights around 11.3°C. Expect roughly 13.3 wet days totalling 82.9mm. Generally workable, with some weather to plan around.
September in Petrozavodsk averages a daily high of 13.8°C with nights around 6.9°C. Expect roughly 13.8 wet days totalling 59.3mm. Demanding conditions — pack for it and plan indoor options.
October in Petrozavodsk averages a daily high of 6.5°C with nights around 1.7°C. Expect roughly 16.2 wet days totalling 57.6mm. A hard month to visit for comfort alone.
November in Petrozavodsk averages a daily high of 0.3°C with nights around -3.9°C. Expect roughly 18.4 wet days totalling 54mm. A hard month to visit for comfort alone.
December in Petrozavodsk averages a daily high of -3.5°C with nights around -8.5°C. Expect roughly 19.8 wet days totalling 45.2mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Petrozavodsk peaks at 72.
Based on 30 years of records, June–August scores highest for comfort in Petrozavodsk, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 21.9°C.
July is the wettest, averaging 86.5mm of rain across roughly 14.7 wet days.
January is the coolest month, with average daily highs around -6.1°C.