| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -1.4° | -11.2° | 16.6mm | 5.4 | 19 |
| February | 0.9° | -9.5° | 19.6mm | 5.8 | 18 |
| March | 8.7° | -2.5° | 49.8mm | 8.3 | 40 |
| April | 16.5° | 3.4° | 98.9mm | 11.1 | 67 |
| May | 22.4° | 9.9° | 138.5mm | 13.4 | 73 |
| June | 27.8° | 15.6° | 132.3mm | 12.6 | 72 |
| July | 29.2° | 17.4° | 101.1mm | 10.3 | 71 |
| August | 27.9° | 15.8° | 119.3mm | 11.8 | 73 |
| September | 25.2° | 11° | 80.4mm | 8.9 | 82 |
| October | 17.4° | 4.1° | 73.6mm | 9.2 | 73 |
| November | 9.1° | -2.4° | 43.5mm | 6.2 | 46 |
| December | 1.5° | -8.3° | 30mm | 5.9 | 18 |
January in Ames averages a daily high of -1.4°C with nights around -11.2°C. Expect roughly 5.4 wet days totalling 16.6mm. A hard month to visit for comfort alone.
February in Ames averages a daily high of 0.9°C with nights around -9.5°C. Expect roughly 5.8 wet days totalling 19.6mm. A hard month to visit for comfort alone.
March in Ames averages a daily high of 8.7°C with nights around -2.5°C. Expect roughly 8.3 wet days totalling 49.8mm. Demanding conditions — pack for it and plan indoor options.
April in Ames averages a daily high of 16.5°C with nights around 3.4°C. Expect roughly 11.1 wet days totalling 98.9mm. Generally workable, with some weather to plan around.
May in Ames averages a daily high of 22.4°C with nights around 9.9°C. Expect roughly 13.4 wet days totalling 138.5mm. Generally workable, with some weather to plan around.
June in Ames averages a daily high of 27.8°C with nights around 15.6°C. Expect roughly 12.6 wet days totalling 132.3mm. Generally workable, with some weather to plan around.
July in Ames averages a daily high of 29.2°C with nights around 17.4°C. Expect roughly 10.3 wet days totalling 101.1mm. Generally workable, with some weather to plan around.
August in Ames averages a daily high of 27.9°C with nights around 15.8°C. Expect roughly 11.8 wet days totalling 119.3mm. Generally workable, with some weather to plan around.
September in Ames averages a daily high of 25.2°C with nights around 11°C. Expect roughly 8.9 wet days totalling 80.4mm. Comfortable conditions for being outdoors all day.
October in Ames averages a daily high of 17.4°C with nights around 4.1°C. Expect roughly 9.2 wet days totalling 73.6mm. Generally workable, with some weather to plan around.
November in Ames averages a daily high of 9.1°C with nights around -2.4°C. Expect roughly 6.2 wet days totalling 43.5mm. Demanding conditions — pack for it and plan indoor options.
December in Ames averages a daily high of 1.5°C with nights around -8.3°C. Expect roughly 5.9 wet days totalling 30mm. 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. Ames peaks at 82.
Based on 30 years of records, September scores highest for comfort in Ames, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 29.2°C.
May is the wettest, averaging 138.5mm of rain across roughly 13.4 wet days.
January is the coolest month, with average daily highs around -1.4°C.