| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.6° | 0.4° | 64.9mm | 16.2 | 22 |
| February | 7.1° | 0.7° | 60mm | 14 | 29 |
| March | 10.2° | 1.6° | 53.5mm | 13 | 42 |
| April | 14.6° | 3.5° | 41mm | 10.6 | 62 |
| May | 18.4° | 7.2° | 60.7mm | 12.4 | 70 |
| June | 21.4° | 10.4° | 67.2mm | 11.8 | 76 |
| July | 22.9° | 12.4° | 86.4mm | 14.4 | 71 |
| August | 23° | 12.1° | 79.8mm | 13.3 | 73 |
| September | 19.6° | 9.6° | 61.9mm | 12.1 | 75 |
| October | 15° | 7° | 67.7mm | 14.1 | 56 |
| November | 9.7° | 3.7° | 63.2mm | 16 | 37 |
| December | 6.2° | 1.2° | 70.8mm | 16.1 | 25 |
January in Deventer averages a daily high of 5.6°C with nights around 0.4°C. Expect roughly 16.2 wet days totalling 64.9mm. A hard month to visit for comfort alone.
February in Deventer averages a daily high of 7.1°C with nights around 0.7°C. Expect roughly 14 wet days totalling 60mm. A hard month to visit for comfort alone.
March in Deventer averages a daily high of 10.2°C with nights around 1.6°C. Expect roughly 13 wet days totalling 53.5mm. Demanding conditions — pack for it and plan indoor options.
April in Deventer averages a daily high of 14.6°C with nights around 3.5°C. Expect roughly 10.6 wet days totalling 41mm. Generally workable, with some weather to plan around.
May in Deventer averages a daily high of 18.4°C with nights around 7.2°C. Expect roughly 12.4 wet days totalling 60.7mm. Generally workable, with some weather to plan around.
June in Deventer averages a daily high of 21.4°C with nights around 10.4°C. Expect roughly 11.8 wet days totalling 67.2mm. Comfortable conditions for being outdoors all day.
July in Deventer averages a daily high of 22.9°C with nights around 12.4°C. Expect roughly 14.4 wet days totalling 86.4mm. Generally workable, with some weather to plan around.
August in Deventer averages a daily high of 23°C with nights around 12.1°C. Expect roughly 13.3 wet days totalling 79.8mm. Generally workable, with some weather to plan around.
September in Deventer averages a daily high of 19.6°C with nights around 9.6°C. Expect roughly 12.1 wet days totalling 61.9mm. Comfortable conditions for being outdoors all day.
October in Deventer averages a daily high of 15°C with nights around 7°C. Expect roughly 14.1 wet days totalling 67.7mm. Generally workable, with some weather to plan around.
November in Deventer averages a daily high of 9.7°C with nights around 3.7°C. Expect roughly 16 wet days totalling 63.2mm. Demanding conditions — pack for it and plan indoor options.
December in Deventer averages a daily high of 6.2°C with nights around 1.2°C. Expect roughly 16.1 wet days totalling 70.8mm. 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. Deventer peaks at 76.
Based on 30 years of records, May–September scores highest for comfort in Deventer, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 23°C.
July is the wettest, averaging 86.4mm of rain across roughly 14.4 wet days.
January is the coolest month, with average daily highs around 5.6°C.