| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 7.1° | 1.9° | 197.3mm | 20.3 | 29 |
| February | 9.4° | 1.9° | 103.2mm | 14.6 | 37 |
| March | 11.5° | 3.5° | 130mm | 17.5 | 43 |
| April | 15.1° | 5.4° | 82.9mm | 13.7 | 57 |
| May | 18.4° | 8.8° | 83.2mm | 12 | 71 |
| June | 21.1° | 11.8° | 51.2mm | 10.3 | 79 |
| July | 24.5° | 13.8° | 31.4mm | 5.4 | 89 |
| August | 24.7° | 13.8° | 38.6mm | 6.7 | 87 |
| September | 21.4° | 11.2° | 78.4mm | 9.3 | 81 |
| October | 15° | 7.2° | 141.5mm | 16 | 54 |
| November | 10.1° | 4.1° | 200.5mm | 18.8 | 38 |
| December | 6.1° | 1.1° | 199.7mm | 19.3 | 24 |
January in Newton averages a daily high of 7.1°C with nights around 1.9°C. Expect roughly 20.3 wet days totalling 197.3mm. A hard month to visit for comfort alone.
February in Newton averages a daily high of 9.4°C with nights around 1.9°C. Expect roughly 14.6 wet days totalling 103.2mm. Demanding conditions — pack for it and plan indoor options.
March in Newton averages a daily high of 11.5°C with nights around 3.5°C. Expect roughly 17.5 wet days totalling 130mm. Demanding conditions — pack for it and plan indoor options.
April in Newton averages a daily high of 15.1°C with nights around 5.4°C. Expect roughly 13.7 wet days totalling 82.9mm. Generally workable, with some weather to plan around.
May in Newton averages a daily high of 18.4°C with nights around 8.8°C. Expect roughly 12 wet days totalling 83.2mm. Generally workable, with some weather to plan around.
June in Newton averages a daily high of 21.1°C with nights around 11.8°C. Expect roughly 10.3 wet days totalling 51.2mm. Comfortable conditions for being outdoors all day.
July in Newton averages a daily high of 24.5°C with nights around 13.8°C. Expect roughly 5.4 wet days totalling 31.4mm. Comfortable conditions for being outdoors all day.
August in Newton averages a daily high of 24.7°C with nights around 13.8°C. Expect roughly 6.7 wet days totalling 38.6mm. Comfortable conditions for being outdoors all day.
September in Newton averages a daily high of 21.4°C with nights around 11.2°C. Expect roughly 9.3 wet days totalling 78.4mm. Comfortable conditions for being outdoors all day.
October in Newton averages a daily high of 15°C with nights around 7.2°C. Expect roughly 16 wet days totalling 141.5mm. Demanding conditions — pack for it and plan indoor options.
November in Newton averages a daily high of 10.1°C with nights around 4.1°C. Expect roughly 18.8 wet days totalling 200.5mm. Demanding conditions — pack for it and plan indoor options.
December in Newton averages a daily high of 6.1°C with nights around 1.1°C. Expect roughly 19.3 wet days totalling 199.7mm. 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. Newton peaks at 89.
Based on 30 years of records, July–September scores highest for comfort in Newton, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 24.7°C.
November is the wettest, averaging 200.5mm of rain across roughly 18.8 wet days.
December is the coolest month, with average daily highs around 6.1°C.