| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.8° | 0.1° | 64mm | 15.6 | 22 |
| February | 7.8° | 0.6° | 57.9mm | 14.7 | 29 |
| March | 11.5° | 2° | 55.8mm | 14 | 45 |
| April | 16° | 4.4° | 48.9mm | 11.3 | 65 |
| May | 19.9° | 8.1° | 64.6mm | 12.6 | 74 |
| June | 23.2° | 11.3° | 83.4mm | 12.9 | 74 |
| July | 24.8° | 13.2° | 87.9mm | 13.9 | 72 |
| August | 24.7° | 13° | 86.8mm | 13.6 | 73 |
| September | 20.7° | 9.8° | 66.2mm | 12.1 | 76 |
| October | 15.7° | 7.2° | 63mm | 13.7 | 59 |
| November | 10° | 3.6° | 64.3mm | 15.2 | 38 |
| December | 6.5° | 1.1° | 65.7mm | 17.1 | 25 |
January in Troisdorf averages a daily high of 5.8°C with nights around 0.1°C. Expect roughly 15.6 wet days totalling 64mm. A hard month to visit for comfort alone.
February in Troisdorf averages a daily high of 7.8°C with nights around 0.6°C. Expect roughly 14.7 wet days totalling 57.9mm. A hard month to visit for comfort alone.
March in Troisdorf averages a daily high of 11.5°C with nights around 2°C. Expect roughly 14 wet days totalling 55.8mm. Demanding conditions — pack for it and plan indoor options.
April in Troisdorf averages a daily high of 16°C with nights around 4.4°C. Expect roughly 11.3 wet days totalling 48.9mm. Generally workable, with some weather to plan around.
May in Troisdorf averages a daily high of 19.9°C with nights around 8.1°C. Expect roughly 12.6 wet days totalling 64.6mm. Generally workable, with some weather to plan around.
June in Troisdorf averages a daily high of 23.2°C with nights around 11.3°C. Expect roughly 12.9 wet days totalling 83.4mm. Generally workable, with some weather to plan around.
July in Troisdorf averages a daily high of 24.8°C with nights around 13.2°C. Expect roughly 13.9 wet days totalling 87.9mm. Generally workable, with some weather to plan around.
August in Troisdorf averages a daily high of 24.7°C with nights around 13°C. Expect roughly 13.6 wet days totalling 86.8mm. Generally workable, with some weather to plan around.
September in Troisdorf averages a daily high of 20.7°C with nights around 9.8°C. Expect roughly 12.1 wet days totalling 66.2mm. Comfortable conditions for being outdoors all day.
October in Troisdorf averages a daily high of 15.7°C with nights around 7.2°C. Expect roughly 13.7 wet days totalling 63mm. Generally workable, with some weather to plan around.
November in Troisdorf averages a daily high of 10°C with nights around 3.6°C. Expect roughly 15.2 wet days totalling 64.3mm. Demanding conditions — pack for it and plan indoor options.
December in Troisdorf averages a daily high of 6.5°C with nights around 1.1°C. Expect roughly 17.1 wet days totalling 65.7mm. 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. Troisdorf peaks at 76.
Based on 30 years of records, May–September scores highest for comfort in Troisdorf, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 24.8°C.
July is the wettest, averaging 87.9mm of rain across roughly 13.9 wet days.
January is the coolest month, with average daily highs around 5.8°C.