| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 7.9° | 1.4° | 50.8mm | 14.7 | 31 |
| February | 9° | 1.8° | 45.2mm | 13.2 | 38 |
| March | 11.3° | 2.8° | 42.2mm | 12.5 | 47 |
| April | 14.4° | 4.3° | 44mm | 11.6 | 59 |
| May | 17.6° | 7.3° | 57.4mm | 12.1 | 68 |
| June | 20.6° | 10.2° | 55.3mm | 11 | 78 |
| July | 22.9° | 12° | 56.3mm | 10.8 | 78 |
| August | 22.5° | 12.2° | 59.9mm | 11.9 | 76 |
| September | 19.6° | 10.1° | 51.1mm | 11.6 | 76 |
| October | 15.3° | 7.6° | 66.8mm | 13.8 | 57 |
| November | 10.7° | 4.1° | 58.6mm | 15.6 | 40 |
| December | 8.2° | 1.8° | 59mm | 15.3 | 32 |
January in Northampton averages a daily high of 7.9°C with nights around 1.4°C. Expect roughly 14.7 wet days totalling 50.8mm. A hard month to visit for comfort alone.
February in Northampton averages a daily high of 9°C with nights around 1.8°C. Expect roughly 13.2 wet days totalling 45.2mm. Demanding conditions — pack for it and plan indoor options.
March in Northampton averages a daily high of 11.3°C with nights around 2.8°C. Expect roughly 12.5 wet days totalling 42.2mm. Demanding conditions — pack for it and plan indoor options.
April in Northampton averages a daily high of 14.4°C with nights around 4.3°C. Expect roughly 11.6 wet days totalling 44mm. Generally workable, with some weather to plan around.
May in Northampton averages a daily high of 17.6°C with nights around 7.3°C. Expect roughly 12.1 wet days totalling 57.4mm. Generally workable, with some weather to plan around.
June in Northampton averages a daily high of 20.6°C with nights around 10.2°C. Expect roughly 11 wet days totalling 55.3mm. Comfortable conditions for being outdoors all day.
July in Northampton averages a daily high of 22.9°C with nights around 12°C. Expect roughly 10.8 wet days totalling 56.3mm. Comfortable conditions for being outdoors all day.
August in Northampton averages a daily high of 22.5°C with nights around 12.2°C. Expect roughly 11.9 wet days totalling 59.9mm. Comfortable conditions for being outdoors all day.
September in Northampton averages a daily high of 19.6°C with nights around 10.1°C. Expect roughly 11.6 wet days totalling 51.1mm. Comfortable conditions for being outdoors all day.
October in Northampton averages a daily high of 15.3°C with nights around 7.6°C. Expect roughly 13.8 wet days totalling 66.8mm. Generally workable, with some weather to plan around.
November in Northampton averages a daily high of 10.7°C with nights around 4.1°C. Expect roughly 15.6 wet days totalling 58.6mm. Demanding conditions — pack for it and plan indoor options.
December in Northampton averages a daily high of 8.2°C with nights around 1.8°C. Expect roughly 15.3 wet days totalling 59mm. 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. Northampton peaks at 78.
Based on 30 years of records, June–September scores highest for comfort in Northampton, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.9°C.
October is the wettest, averaging 66.8mm of rain across roughly 13.8 wet days.
January is the coolest month, with average daily highs around 7.9°C.