| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.1° | -5.4° | 29.9mm | 5.8 | 23 |
| February | 7.9° | -3.6° | 16.9mm | 3.7 | 45 |
| March | 13.4° | -1.1° | 21.6mm | 6.1 | 62 |
| April | 17.8° | 1.9° | 19.1mm | 5.9 | 81 |
| May | 22.5° | 7.4° | 29mm | 4.9 | 90 |
| June | 28° | 11.6° | 20.3mm | 3.9 | 88 |
| July | 34.3° | 14.7° | 4.6mm | 1 | 69 |
| August | 32.9° | 13.3° | 6.5mm | 1.6 | 73 |
| September | 27.5° | 8.1° | 11mm | 1.8 | 94 |
| October | 19.4° | 1.8° | 17.2mm | 3.8 | 90 |
| November | 9.7° | -2.6° | 21.1mm | 4.9 | 50 |
| December | 3.1° | -5.4° | 24.7mm | 5.3 | 24 |
January in Caldwell averages a daily high of 3.1°C with nights around -5.4°C. Expect roughly 5.8 wet days totalling 29.9mm. A hard month to visit for comfort alone.
February in Caldwell averages a daily high of 7.9°C with nights around -3.6°C. Expect roughly 3.7 wet days totalling 16.9mm. Demanding conditions — pack for it and plan indoor options.
March in Caldwell averages a daily high of 13.4°C with nights around -1.1°C. Expect roughly 6.1 wet days totalling 21.6mm. Generally workable, with some weather to plan around.
April in Caldwell averages a daily high of 17.8°C with nights around 1.9°C. Expect roughly 5.9 wet days totalling 19.1mm. Comfortable conditions for being outdoors all day.
May in Caldwell averages a daily high of 22.5°C with nights around 7.4°C. Expect roughly 4.9 wet days totalling 29mm. Comfortable conditions for being outdoors all day.
June in Caldwell averages a daily high of 28°C with nights around 11.6°C. Expect roughly 3.9 wet days totalling 20.3mm. Comfortable conditions for being outdoors all day.
July in Caldwell averages a daily high of 34.3°C with nights around 14.7°C. Rain is rare — about 1 wet days and 4.6mm across the month. Generally workable, with some weather to plan around.
August in Caldwell averages a daily high of 32.9°C with nights around 13.3°C. Rain is rare — about 1.6 wet days and 6.5mm across the month. Generally workable, with some weather to plan around.
September in Caldwell averages a daily high of 27.5°C with nights around 8.1°C. Rain is rare — about 1.8 wet days and 11mm across the month. Comfortable conditions for being outdoors all day.
October in Caldwell averages a daily high of 19.4°C with nights around 1.8°C. Expect roughly 3.8 wet days totalling 17.2mm. Comfortable conditions for being outdoors all day.
November in Caldwell averages a daily high of 9.7°C with nights around -2.6°C. Expect roughly 4.9 wet days totalling 21.1mm. Demanding conditions — pack for it and plan indoor options.
December in Caldwell averages a daily high of 3.1°C with nights around -5.4°C. Expect roughly 5.3 wet days totalling 24.7mm. 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. Caldwell peaks at 94.
Based on 30 years of records, May–June scores highest for comfort in Caldwell, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 34.3°C.
January is the wettest, averaging 29.9mm of rain across roughly 5.8 wet days.
January is the coolest month, with average daily highs around 3.1°C.