| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 4.2° | -5° | 77.6mm | 10.5 | 18 |
| February | 5.9° | -4.3° | 64.6mm | 9.1 | 27 |
| March | 11.2° | -0.3° | 82.8mm | 10.2 | 48 |
| April | 17.8° | 5° | 91.7mm | 11.2 | 71 |
| May | 23.2° | 10.4° | 93.6mm | 12.9 | 74 |
| June | 27.8° | 15.6° | 106.4mm | 11.1 | 75 |
| July | 30.3° | 18.6° | 112.5mm | 10.6 | 66 |
| August | 29.3° | 17.7° | 94.2mm | 9.7 | 71 |
| September | 25.4° | 13.6° | 120mm | 9.3 | 81 |
| October | 19.1° | 7.2° | 107.7mm | 10 | 77 |
| November | 12.3° | 1.1° | 79.4mm | 9.5 | 55 |
| December | 6.6° | -2.5° | 90.1mm | 10.9 | 29 |
January in Lancaster averages a daily high of 4.2°C with nights around -5°C. Expect roughly 10.5 wet days totalling 77.6mm. A hard month to visit for comfort alone.
February in Lancaster averages a daily high of 5.9°C with nights around -4.3°C. Expect roughly 9.1 wet days totalling 64.6mm. A hard month to visit for comfort alone.
March in Lancaster averages a daily high of 11.2°C with nights around -0.3°C. Expect roughly 10.2 wet days totalling 82.8mm. Demanding conditions — pack for it and plan indoor options.
April in Lancaster averages a daily high of 17.8°C with nights around 5°C. Expect roughly 11.2 wet days totalling 91.7mm. Generally workable, with some weather to plan around.
May in Lancaster averages a daily high of 23.2°C with nights around 10.4°C. Expect roughly 12.9 wet days totalling 93.6mm. Generally workable, with some weather to plan around.
June in Lancaster averages a daily high of 27.8°C with nights around 15.6°C. Expect roughly 11.1 wet days totalling 106.4mm. Comfortable conditions for being outdoors all day.
July in Lancaster averages a daily high of 30.3°C with nights around 18.6°C. Expect roughly 10.6 wet days totalling 112.5mm. Generally workable, with some weather to plan around.
August in Lancaster averages a daily high of 29.3°C with nights around 17.7°C. Expect roughly 9.7 wet days totalling 94.2mm. Generally workable, with some weather to plan around.
September in Lancaster averages a daily high of 25.4°C with nights around 13.6°C. Expect roughly 9.3 wet days totalling 120mm. Comfortable conditions for being outdoors all day.
October in Lancaster averages a daily high of 19.1°C with nights around 7.2°C. Expect roughly 10 wet days totalling 107.7mm. Comfortable conditions for being outdoors all day.
November in Lancaster averages a daily high of 12.3°C with nights around 1.1°C. Expect roughly 9.5 wet days totalling 79.4mm. Generally workable, with some weather to plan around.
December in Lancaster averages a daily high of 6.6°C with nights around -2.5°C. Expect roughly 10.9 wet days totalling 90.1mm. 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. Lancaster peaks at 81.
Based on 30 years of records, May–June scores highest for comfort in Lancaster, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 30.3°C.
September is the wettest, averaging 120mm of rain across roughly 9.3 wet days.
January is the coolest month, with average daily highs around 4.2°C.