| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 2.7° | -5.2° | 72mm | 10.1 | 14 |
| February | 4.4° | -4.7° | 68.8mm | 8.5 | 23 |
| March | 9.7° | -0.7° | 85.8mm | 9.6 | 44 |
| April | 16.6° | 4.9° | 97.4mm | 11.6 | 66 |
| May | 22.4° | 10.8° | 115.6mm | 13.1 | 74 |
| June | 27.3° | 16° | 114.6mm | 11.7 | 75 |
| July | 30° | 18.6° | 120.3mm | 11.3 | 65 |
| August | 28.6° | 17.5° | 115.3mm | 10.7 | 72 |
| September | 24.5° | 13.2° | 126.9mm | 9.2 | 82 |
| October | 17.6° | 6.9° | 96.9mm | 10.7 | 71 |
| November | 11.3° | 1.4° | 67.3mm | 8.7 | 54 |
| December | 5.2° | -2.6° | 90.1mm | 10.2 | 25 |
January in Harrisburg averages a daily high of 2.7°C with nights around -5.2°C. Expect roughly 10.1 wet days totalling 72mm. A hard month to visit for comfort alone.
February in Harrisburg averages a daily high of 4.4°C with nights around -4.7°C. Expect roughly 8.5 wet days totalling 68.8mm. A hard month to visit for comfort alone.
March in Harrisburg averages a daily high of 9.7°C with nights around -0.7°C. Expect roughly 9.6 wet days totalling 85.8mm. Demanding conditions — pack for it and plan indoor options.
April in Harrisburg averages a daily high of 16.6°C with nights around 4.9°C. Expect roughly 11.6 wet days totalling 97.4mm. Generally workable, with some weather to plan around.
May in Harrisburg averages a daily high of 22.4°C with nights around 10.8°C. Expect roughly 13.1 wet days totalling 115.6mm. Generally workable, with some weather to plan around.
June in Harrisburg averages a daily high of 27.3°C with nights around 16°C. Expect roughly 11.7 wet days totalling 114.6mm. Comfortable conditions for being outdoors all day.
July in Harrisburg averages a daily high of 30°C with nights around 18.6°C. Expect roughly 11.3 wet days totalling 120.3mm. Generally workable, with some weather to plan around.
August in Harrisburg averages a daily high of 28.6°C with nights around 17.5°C. Expect roughly 10.7 wet days totalling 115.3mm. Generally workable, with some weather to plan around.
September in Harrisburg averages a daily high of 24.5°C with nights around 13.2°C. Expect roughly 9.2 wet days totalling 126.9mm. Comfortable conditions for being outdoors all day.
October in Harrisburg averages a daily high of 17.6°C with nights around 6.9°C. Expect roughly 10.7 wet days totalling 96.9mm. Generally workable, with some weather to plan around.
November in Harrisburg averages a daily high of 11.3°C with nights around 1.4°C. Expect roughly 8.7 wet days totalling 67.3mm. Demanding conditions — pack for it and plan indoor options.
December in Harrisburg averages a daily high of 5.2°C with nights around -2.6°C. Expect roughly 10.2 wet days totalling 90.1mm. 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. Harrisburg peaks at 82.
Based on 30 years of records, May–June scores highest for comfort in Harrisburg, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 30°C.
September is the wettest, averaging 126.9mm of rain across roughly 9.2 wet days.
January is the coolest month, with average daily highs around 2.7°C.