| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.3° | 0.1° | 74.4mm | 17.4 | 20 |
| February | 6.6° | 0.3° | 60.1mm | 14.5 | 26 |
| March | 9.6° | 1.4° | 52.1mm | 13.8 | 38 |
| April | 14.1° | 3.5° | 42.5mm | 11.4 | 58 |
| May | 17.8° | 7° | 57.6mm | 12.5 | 68 |
| June | 20.8° | 10° | 64mm | 12.2 | 76 |
| July | 22.6° | 12.1° | 85.5mm | 14.9 | 70 |
| August | 22.8° | 12° | 79.8mm | 14 | 72 |
| September | 19.4° | 9.5° | 74.5mm | 13.3 | 71 |
| October | 14.6° | 6.7° | 71.2mm | 15.5 | 53 |
| November | 9.3° | 3.4° | 71.8mm | 17.5 | 36 |
| December | 6° | 0.9° | 78.5mm | 17.1 | 24 |
January in Groningen averages a daily high of 5.3°C with nights around 0.1°C. Expect roughly 17.4 wet days totalling 74.4mm. A hard month to visit for comfort alone.
February in Groningen averages a daily high of 6.6°C with nights around 0.3°C. Expect roughly 14.5 wet days totalling 60.1mm. A hard month to visit for comfort alone.
March in Groningen averages a daily high of 9.6°C with nights around 1.4°C. Expect roughly 13.8 wet days totalling 52.1mm. Demanding conditions — pack for it and plan indoor options.
April in Groningen averages a daily high of 14.1°C with nights around 3.5°C. Expect roughly 11.4 wet days totalling 42.5mm. Generally workable, with some weather to plan around.
May in Groningen averages a daily high of 17.8°C with nights around 7°C. Expect roughly 12.5 wet days totalling 57.6mm. Generally workable, with some weather to plan around.
June in Groningen averages a daily high of 20.8°C with nights around 10°C. Expect roughly 12.2 wet days totalling 64mm. Comfortable conditions for being outdoors all day.
July in Groningen averages a daily high of 22.6°C with nights around 12.1°C. Expect roughly 14.9 wet days totalling 85.5mm. Generally workable, with some weather to plan around.
August in Groningen averages a daily high of 22.8°C with nights around 12°C. Expect roughly 14 wet days totalling 79.8mm. Generally workable, with some weather to plan around.
September in Groningen averages a daily high of 19.4°C with nights around 9.5°C. Expect roughly 13.3 wet days totalling 74.5mm. Generally workable, with some weather to plan around.
October in Groningen averages a daily high of 14.6°C with nights around 6.7°C. Expect roughly 15.5 wet days totalling 71.2mm. Demanding conditions — pack for it and plan indoor options.
November in Groningen averages a daily high of 9.3°C with nights around 3.4°C. Expect roughly 17.5 wet days totalling 71.8mm. Demanding conditions — pack for it and plan indoor options.
December in Groningen averages a daily high of 6°C with nights around 0.9°C. Expect roughly 17.1 wet days totalling 78.5mm. 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. Groningen peaks at 76.
Based on 30 years of records, May–September scores highest for comfort in Groningen, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 22.8°C.
July is the wettest, averaging 85.5mm of rain across roughly 14.9 wet days.
January is the coolest month, with average daily highs around 5.3°C.