| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.1° | -6.3° | 103.4mm | 11.4 | 11 |
| February | 4.6° | -5.5° | 92mm | 9.7 | 20 |
| March | 8.5° | -1.5° | 123.3mm | 10.1 | 38 |
| April | 15° | 3.7° | 105.1mm | 11.6 | 61 |
| May | 21° | 9.3° | 83mm | 12.4 | 75 |
| June | 26° | 14.6° | 109.4mm | 11.9 | 76 |
| July | 29.4° | 18.1° | 118.1mm | 11.7 | 67 |
| August | 28.4° | 17.2° | 94.8mm | 9.8 | 75 |
| September | 24.3° | 13.1° | 94.4mm | 9.2 | 82 |
| October | 17.9° | 6.5° | 125.3mm | 11.8 | 70 |
| November | 11.5° | 1.2° | 88.4mm | 9.1 | 53 |
| December | 6° | -3.1° | 140mm | 11.6 | 24 |
January in Newton averages a daily high of 3.1°C with nights around -6.3°C. Expect roughly 11.4 wet days totalling 103.4mm. A hard month to visit for comfort alone.
February in Newton averages a daily high of 4.6°C with nights around -5.5°C. Expect roughly 9.7 wet days totalling 92mm. A hard month to visit for comfort alone.
March in Newton averages a daily high of 8.5°C with nights around -1.5°C. Expect roughly 10.1 wet days totalling 123.3mm. Demanding conditions — pack for it and plan indoor options.
April in Newton averages a daily high of 15°C with nights around 3.7°C. Expect roughly 11.6 wet days totalling 105.1mm. Generally workable, with some weather to plan around.
May in Newton averages a daily high of 21°C with nights around 9.3°C. Expect roughly 12.4 wet days totalling 83mm. Comfortable conditions for being outdoors all day.
June in Newton averages a daily high of 26°C with nights around 14.6°C. Expect roughly 11.9 wet days totalling 109.4mm. Comfortable conditions for being outdoors all day.
July in Newton averages a daily high of 29.4°C with nights around 18.1°C. Expect roughly 11.7 wet days totalling 118.1mm. Generally workable, with some weather to plan around.
August in Newton averages a daily high of 28.4°C with nights around 17.2°C. Expect roughly 9.8 wet days totalling 94.8mm. Comfortable conditions for being outdoors all day.
September in Newton averages a daily high of 24.3°C with nights around 13.1°C. Expect roughly 9.2 wet days totalling 94.4mm. Comfortable conditions for being outdoors all day.
October in Newton averages a daily high of 17.9°C with nights around 6.5°C. Expect roughly 11.8 wet days totalling 125.3mm. Generally workable, with some weather to plan around.
November in Newton averages a daily high of 11.5°C with nights around 1.2°C. Expect roughly 9.1 wet days totalling 88.4mm. Demanding conditions — pack for it and plan indoor options.
December in Newton averages a daily high of 6°C with nights around -3.1°C. Expect roughly 11.6 wet days totalling 140mm. 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 82.
Based on 30 years of records, May–June scores highest for comfort in Newton, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 29.4°C.
December is the wettest, averaging 140mm of rain across roughly 11.6 wet days.
January is the coolest month, with average daily highs around 3.1°C.