| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 7.4° | 2.9° | 148.1mm | 18.6 | 30 |
| February | 8.1° | 3.3° | 78.8mm | 14.3 | 33 |
| March | 10.3° | 4.7° | 84.3mm | 16.1 | 39 |
| April | 13.6° | 6.8° | 62mm | 12.8 | 54 |
| May | 17.4° | 9.8° | 47mm | 9.5 | 73 |
| June | 20.2° | 12.3° | 35.1mm | 8.6 | 83 |
| July | 22.7° | 14.2° | 22.2mm | 4.5 | 91 |
| August | 22.2° | 14.4° | 25.6mm | 5.5 | 89 |
| September | 18.7° | 12° | 51.3mm | 8.3 | 79 |
| October | 13.6° | 8.6° | 116mm | 15 | 50 |
| November | 9.7° | 5° | 146.3mm | 17.7 | 37 |
| December | 7° | 2.5° | 140.2mm | 19.2 | 28 |
January in Delta averages a daily high of 7.4°C with nights around 2.9°C. Expect roughly 18.6 wet days totalling 148.1mm. A hard month to visit for comfort alone.
February in Delta averages a daily high of 8.1°C with nights around 3.3°C. Expect roughly 14.3 wet days totalling 78.8mm. A hard month to visit for comfort alone.
March in Delta averages a daily high of 10.3°C with nights around 4.7°C. Expect roughly 16.1 wet days totalling 84.3mm. Demanding conditions — pack for it and plan indoor options.
April in Delta averages a daily high of 13.6°C with nights around 6.8°C. Expect roughly 12.8 wet days totalling 62mm. Demanding conditions — pack for it and plan indoor options.
May in Delta averages a daily high of 17.4°C with nights around 9.8°C. Expect roughly 9.5 wet days totalling 47mm. Generally workable, with some weather to plan around.
June in Delta averages a daily high of 20.2°C with nights around 12.3°C. Expect roughly 8.6 wet days totalling 35.1mm. Comfortable conditions for being outdoors all day.
July in Delta averages a daily high of 22.7°C with nights around 14.2°C. Expect roughly 4.5 wet days totalling 22.2mm. Comfortable conditions for being outdoors all day.
August in Delta averages a daily high of 22.2°C with nights around 14.4°C. Expect roughly 5.5 wet days totalling 25.6mm. Comfortable conditions for being outdoors all day.
September in Delta averages a daily high of 18.7°C with nights around 12°C. Expect roughly 8.3 wet days totalling 51.3mm. Comfortable conditions for being outdoors all day.
October in Delta averages a daily high of 13.6°C with nights around 8.6°C. Expect roughly 15 wet days totalling 116mm. Demanding conditions — pack for it and plan indoor options.
November in Delta averages a daily high of 9.7°C with nights around 5°C. Expect roughly 17.7 wet days totalling 146.3mm. Demanding conditions — pack for it and plan indoor options.
December in Delta averages a daily high of 7°C with nights around 2.5°C. Expect roughly 19.2 wet days totalling 140.2mm. 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. Delta peaks at 91.
Based on 30 years of records, June–August scores highest for comfort in Delta, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.7°C.
January is the wettest, averaging 148.1mm of rain across roughly 18.6 wet days.
December is the coolest month, with average daily highs around 7°C.