| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 1.1° | -4.5° | 98.2mm | 13.8 | 8 |
| February | 2° | -4.2° | 78.9mm | 13.7 | 8 |
| March | 6° | -2.1° | 65.3mm | 12.3 | 24 |
| April | 11.2° | 1.8° | 55.2mm | 11.3 | 49 |
| May | 16.4° | 6.7° | 69.6mm | 12.9 | 63 |
| June | 20.5° | 10.7° | 79mm | 13.7 | 73 |
| July | 22.2° | 12.9° | 92.3mm | 14.4 | 71 |
| August | 21.1° | 12.1° | 115.2mm | 15.4 | 70 |
| September | 17.2° | 9° | 112.9mm | 11.9 | 67 |
| October | 10.8° | 4.3° | 133mm | 14.3 | 42 |
| November | 5.8° | 0.7° | 118mm | 15.8 | 23 |
| December | 2° | -3.5° | 106.7mm | 15.3 | 7 |
January in Tønsberg averages a daily high of 1.1°C with nights around -4.5°C. Expect roughly 13.8 wet days totalling 98.2mm. A hard month to visit for comfort alone.
February in Tønsberg averages a daily high of 2°C with nights around -4.2°C. Expect roughly 13.7 wet days totalling 78.9mm. A hard month to visit for comfort alone.
March in Tønsberg averages a daily high of 6°C with nights around -2.1°C. Expect roughly 12.3 wet days totalling 65.3mm. A hard month to visit for comfort alone.
April in Tønsberg averages a daily high of 11.2°C with nights around 1.8°C. Expect roughly 11.3 wet days totalling 55.2mm. Demanding conditions — pack for it and plan indoor options.
May in Tønsberg averages a daily high of 16.4°C with nights around 6.7°C. Expect roughly 12.9 wet days totalling 69.6mm. Generally workable, with some weather to plan around.
June in Tønsberg averages a daily high of 20.5°C with nights around 10.7°C. Expect roughly 13.7 wet days totalling 79mm. Generally workable, with some weather to plan around.
July in Tønsberg averages a daily high of 22.2°C with nights around 12.9°C. Expect roughly 14.4 wet days totalling 92.3mm. Generally workable, with some weather to plan around.
August in Tønsberg averages a daily high of 21.1°C with nights around 12.1°C. Expect roughly 15.4 wet days totalling 115.2mm. Generally workable, with some weather to plan around.
September in Tønsberg averages a daily high of 17.2°C with nights around 9°C. Expect roughly 11.9 wet days totalling 112.9mm. Generally workable, with some weather to plan around.
October in Tønsberg averages a daily high of 10.8°C with nights around 4.3°C. Expect roughly 14.3 wet days totalling 133mm. Demanding conditions — pack for it and plan indoor options.
November in Tønsberg averages a daily high of 5.8°C with nights around 0.7°C. Expect roughly 15.8 wet days totalling 118mm. A hard month to visit for comfort alone.
December in Tønsberg averages a daily high of 2°C with nights around -3.5°C. Expect roughly 15.3 wet days totalling 106.7mm. 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. Tønsberg peaks at 73.
Based on 30 years of records, June–September scores highest for comfort in Tønsberg, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.2°C.
October is the wettest, averaging 133mm of rain across roughly 14.3 wet days.
January is the coolest month, with average daily highs around 1.1°C.