| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 1.2° | -4.7° | 47.5mm | 9.5 | 16 |
| February | 3.1° | -3.2° | 82mm | 14 | 10 |
| March | 6.2° | -2.3° | 56mm | 11.8 | 26 |
| April | 11.6° | 0.1° | 50.7mm | 8.9 | 52 |
| May | 17° | 5.3° | 55.1mm | 10.8 | 69 |
| June | 21.2° | 10° | 63.2mm | 10.8 | 78 |
| July | 22.5° | 11.5° | 92.2mm | 11.2 | 78 |
| August | 21° | 10.8° | 103.2mm | 12.5 | 75 |
| September | 17.7° | 8.2° | 101.6mm | 11.9 | 69 |
| October | 11.5° | 4.1° | 109.8mm | 15 | 43 |
| November | 5.9° | 0.4° | 97.1mm | 15.9 | 22 |
| December | 2.8° | -3° | 102mm | 15.3 | 8 |
January in Fredrikstad averages a daily high of 1.2°C with nights around -4.7°C. Expect roughly 9.5 wet days totalling 47.5mm. A hard month to visit for comfort alone.
February in Fredrikstad averages a daily high of 3.1°C with nights around -3.2°C. Expect roughly 14 wet days totalling 82mm. A hard month to visit for comfort alone.
March in Fredrikstad averages a daily high of 6.2°C with nights around -2.3°C. Expect roughly 11.8 wet days totalling 56mm. A hard month to visit for comfort alone.
April in Fredrikstad averages a daily high of 11.6°C with nights around 0.1°C. Expect roughly 8.9 wet days totalling 50.7mm. Demanding conditions — pack for it and plan indoor options.
May in Fredrikstad averages a daily high of 17°C with nights around 5.3°C. Expect roughly 10.8 wet days totalling 55.1mm. Generally workable, with some weather to plan around.
June in Fredrikstad averages a daily high of 21.2°C with nights around 10°C. Expect roughly 10.8 wet days totalling 63.2mm. Comfortable conditions for being outdoors all day.
July in Fredrikstad averages a daily high of 22.5°C with nights around 11.5°C. Expect roughly 11.2 wet days totalling 92.2mm. Comfortable conditions for being outdoors all day.
August in Fredrikstad averages a daily high of 21°C with nights around 10.8°C. Expect roughly 12.5 wet days totalling 103.2mm. Comfortable conditions for being outdoors all day.
September in Fredrikstad averages a daily high of 17.7°C with nights around 8.2°C. Expect roughly 11.9 wet days totalling 101.6mm. Generally workable, with some weather to plan around.
October in Fredrikstad averages a daily high of 11.5°C with nights around 4.1°C. Expect roughly 15 wet days totalling 109.8mm. Demanding conditions — pack for it and plan indoor options.
November in Fredrikstad averages a daily high of 5.9°C with nights around 0.4°C. Expect roughly 15.9 wet days totalling 97.1mm. A hard month to visit for comfort alone.
December in Fredrikstad averages a daily high of 2.8°C with nights around -3°C. Expect roughly 15.3 wet days totalling 102mm. 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. Fredrikstad peaks at 78.
Based on 30 years of records, June–August scores highest for comfort in Fredrikstad, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.5°C.
October is the wettest, averaging 109.8mm of rain across roughly 15 wet days.
January is the coolest month, with average daily highs around 1.2°C.