| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -0.7° | -11.2° | 23mm | 6.3 | 17 |
| February | 1.6° | -9.7° | 22.2mm | 5.9 | 18 |
| March | 9.1° | -2.9° | 47.1mm | 7.3 | 43 |
| April | 16.4° | 2.7° | 103.4mm | 10.2 | 68 |
| May | 22.2° | 9.5° | 133.3mm | 12.2 | 76 |
| June | 27.8° | 15.4° | 138.6mm | 11.1 | 75 |
| July | 30.3° | 17.7° | 108.3mm | 8.5 | 70 |
| August | 29° | 16.1° | 105.4mm | 9.5 | 73 |
| September | 25.5° | 11° | 83.7mm | 7.8 | 84 |
| October | 17.8° | 4.3° | 69.2mm | 8.4 | 76 |
| November | 9.4° | -2.1° | 41.1mm | 6.1 | 48 |
| December | 1.9° | -8.6° | 31.9mm | 6.7 | 17 |
January in Ankeny averages a daily high of -0.7°C with nights around -11.2°C. Expect roughly 6.3 wet days totalling 23mm. A hard month to visit for comfort alone.
February in Ankeny averages a daily high of 1.6°C with nights around -9.7°C. Expect roughly 5.9 wet days totalling 22.2mm. A hard month to visit for comfort alone.
March in Ankeny averages a daily high of 9.1°C with nights around -2.9°C. Expect roughly 7.3 wet days totalling 47.1mm. Demanding conditions — pack for it and plan indoor options.
April in Ankeny averages a daily high of 16.4°C with nights around 2.7°C. Expect roughly 10.2 wet days totalling 103.4mm. Generally workable, with some weather to plan around.
May in Ankeny averages a daily high of 22.2°C with nights around 9.5°C. Expect roughly 12.2 wet days totalling 133.3mm. Comfortable conditions for being outdoors all day.
June in Ankeny averages a daily high of 27.8°C with nights around 15.4°C. Expect roughly 11.1 wet days totalling 138.6mm. Comfortable conditions for being outdoors all day.
July in Ankeny averages a daily high of 30.3°C with nights around 17.7°C. Expect roughly 8.5 wet days totalling 108.3mm. Generally workable, with some weather to plan around.
August in Ankeny averages a daily high of 29°C with nights around 16.1°C. Expect roughly 9.5 wet days totalling 105.4mm. Generally workable, with some weather to plan around.
September in Ankeny averages a daily high of 25.5°C with nights around 11°C. Expect roughly 7.8 wet days totalling 83.7mm. Comfortable conditions for being outdoors all day.
October in Ankeny averages a daily high of 17.8°C with nights around 4.3°C. Expect roughly 8.4 wet days totalling 69.2mm. Comfortable conditions for being outdoors all day.
November in Ankeny averages a daily high of 9.4°C with nights around -2.1°C. Expect roughly 6.1 wet days totalling 41.1mm. Demanding conditions — pack for it and plan indoor options.
December in Ankeny averages a daily high of 1.9°C with nights around -8.6°C. Expect roughly 6.7 wet days totalling 31.9mm. 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. Ankeny peaks at 84.
Based on 30 years of records, September–October scores highest for comfort in Ankeny, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 30.3°C.
June is the wettest, averaging 138.6mm of rain across roughly 11.1 wet days.
January is the coolest month, with average daily highs around -0.7°C.