| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.6° | -4.1° | 83.4mm | 11.3 | 16 |
| February | 4.8° | -3.4° | 80.4mm | 10.4 | 22 |
| March | 8.8° | 0.2° | 103.5mm | 11 | 39 |
| April | 14.5° | 5.3° | 107.1mm | 11.4 | 60 |
| May | 19.9° | 10.9° | 91.9mm | 12.2 | 75 |
| June | 25.2° | 16.3° | 95.2mm | 11.5 | 77 |
| July | 28.4° | 19.9° | 96.6mm | 9.2 | 76 |
| August | 27.6° | 19.5° | 92.3mm | 9.2 | 79 |
| September | 24.1° | 15.5° | 102.7mm | 8 | 84 |
| October | 18.1° | 9.2° | 99.6mm | 9.8 | 74 |
| November | 11.9° | 3.3° | 77mm | 9.3 | 55 |
| December | 6.5° | -1.1° | 103.8mm | 11.7 | 29 |
January in Fairfield averages a daily high of 3.6°C with nights around -4.1°C. Expect roughly 11.3 wet days totalling 83.4mm. A hard month to visit for comfort alone.
February in Fairfield averages a daily high of 4.8°C with nights around -3.4°C. Expect roughly 10.4 wet days totalling 80.4mm. A hard month to visit for comfort alone.
March in Fairfield averages a daily high of 8.8°C with nights around 0.2°C. Expect roughly 11 wet days totalling 103.5mm. Demanding conditions — pack for it and plan indoor options.
April in Fairfield averages a daily high of 14.5°C with nights around 5.3°C. Expect roughly 11.4 wet days totalling 107.1mm. Generally workable, with some weather to plan around.
May in Fairfield averages a daily high of 19.9°C with nights around 10.9°C. Expect roughly 12.2 wet days totalling 91.9mm. Comfortable conditions for being outdoors all day.
June in Fairfield averages a daily high of 25.2°C with nights around 16.3°C. Expect roughly 11.5 wet days totalling 95.2mm. Comfortable conditions for being outdoors all day.
July in Fairfield averages a daily high of 28.4°C with nights around 19.9°C. Expect roughly 9.2 wet days totalling 96.6mm. Comfortable conditions for being outdoors all day.
August in Fairfield averages a daily high of 27.6°C with nights around 19.5°C. Expect roughly 9.2 wet days totalling 92.3mm. Comfortable conditions for being outdoors all day.
September in Fairfield averages a daily high of 24.1°C with nights around 15.5°C. Expect roughly 8 wet days totalling 102.7mm. Comfortable conditions for being outdoors all day.
October in Fairfield averages a daily high of 18.1°C with nights around 9.2°C. Expect roughly 9.8 wet days totalling 99.6mm. Generally workable, with some weather to plan around.
November in Fairfield averages a daily high of 11.9°C with nights around 3.3°C. Expect roughly 9.3 wet days totalling 77mm. Generally workable, with some weather to plan around.
December in Fairfield averages a daily high of 6.5°C with nights around -1.1°C. Expect roughly 11.7 wet days totalling 103.8mm. 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. Fairfield peaks at 84.
Based on 30 years of records, June–September scores highest for comfort in Fairfield, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 28.4°C.
April is the wettest, averaging 107.1mm of rain across roughly 11.4 wet days.
January is the coolest month, with average daily highs around 3.6°C.