| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.9° | -1.2° | 49mm | 14 | 16 |
| February | 6.2° | -0.7° | 42.6mm | 13 | 26 |
| March | 10.3° | 1.1° | 41.7mm | 12.4 | 43 |
| April | 15.2° | 4° | 39.9mm | 10.8 | 63 |
| May | 19.4° | 7.9° | 64mm | 11.6 | 75 |
| June | 23.2° | 11.2° | 54.2mm | 11.4 | 77 |
| July | 25° | 13° | 73.5mm | 12.9 | 74 |
| August | 24.8° | 12.9° | 62.8mm | 11.6 | 77 |
| September | 20° | 9.3° | 48.5mm | 10.3 | 79 |
| October | 14.4° | 6.1° | 47.9mm | 12.3 | 57 |
| November | 8.1° | 2.6° | 49.1mm | 13.3 | 35 |
| December | 4.6° | -0.2° | 52.4mm | 15.4 | 17 |
January in Gießen averages a daily high of 3.9°C with nights around -1.2°C. Expect roughly 14 wet days totalling 49mm. A hard month to visit for comfort alone.
February in Gießen averages a daily high of 6.2°C with nights around -0.7°C. Expect roughly 13 wet days totalling 42.6mm. A hard month to visit for comfort alone.
March in Gießen averages a daily high of 10.3°C with nights around 1.1°C. Expect roughly 12.4 wet days totalling 41.7mm. Demanding conditions — pack for it and plan indoor options.
April in Gießen averages a daily high of 15.2°C with nights around 4°C. Expect roughly 10.8 wet days totalling 39.9mm. Generally workable, with some weather to plan around.
May in Gießen averages a daily high of 19.4°C with nights around 7.9°C. Expect roughly 11.6 wet days totalling 64mm. Comfortable conditions for being outdoors all day.
June in Gießen averages a daily high of 23.2°C with nights around 11.2°C. Expect roughly 11.4 wet days totalling 54.2mm. Comfortable conditions for being outdoors all day.
July in Gießen averages a daily high of 25°C with nights around 13°C. Expect roughly 12.9 wet days totalling 73.5mm. Generally workable, with some weather to plan around.
August in Gießen averages a daily high of 24.8°C with nights around 12.9°C. Expect roughly 11.6 wet days totalling 62.8mm. Comfortable conditions for being outdoors all day.
September in Gießen averages a daily high of 20°C with nights around 9.3°C. Expect roughly 10.3 wet days totalling 48.5mm. Comfortable conditions for being outdoors all day.
October in Gießen averages a daily high of 14.4°C with nights around 6.1°C. Expect roughly 12.3 wet days totalling 47.9mm. Generally workable, with some weather to plan around.
November in Gießen averages a daily high of 8.1°C with nights around 2.6°C. Expect roughly 13.3 wet days totalling 49.1mm. Demanding conditions — pack for it and plan indoor options.
December in Gießen averages a daily high of 4.6°C with nights around -0.2°C. Expect roughly 15.4 wet days totalling 52.4mm. 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. Gießen peaks at 79.
Based on 30 years of records, May–September scores highest for comfort in Gießen, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 25°C.
July is the wettest, averaging 73.5mm of rain across roughly 12.9 wet days.
January is the coolest month, with average daily highs around 3.9°C.