| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -1.2° | -10° | 31mm | 8.6 | 13 |
| February | 1.7° | -8.2° | 33.8mm | 7.4 | 15 |
| March | 9.5° | -1.8° | 51.7mm | 9.3 | 42 |
| April | 17.3° | 4.1° | 100.4mm | 11.2 | 69 |
| May | 23.1° | 10.3° | 121.3mm | 13 | 74 |
| June | 28.1° | 15.9° | 145.5mm | 12.1 | 71 |
| July | 29.6° | 18° | 98.2mm | 8.8 | 72 |
| August | 28.7° | 16.9° | 103.8mm | 9.2 | 75 |
| September | 25.6° | 12.4° | 90.3mm | 7.9 | 84 |
| October | 18° | 5.8° | 85.3mm | 9.5 | 75 |
| November | 9.3° | -0.8° | 51.3mm | 7.6 | 46 |
| December | 1.7° | -6.8° | 43.4mm | 9.2 | 13 |
January in Cedar Rapids averages a daily high of -1.2°C with nights around -10°C. Expect roughly 8.6 wet days totalling 31mm. A hard month to visit for comfort alone.
February in Cedar Rapids averages a daily high of 1.7°C with nights around -8.2°C. Expect roughly 7.4 wet days totalling 33.8mm. A hard month to visit for comfort alone.
March in Cedar Rapids averages a daily high of 9.5°C with nights around -1.8°C. Expect roughly 9.3 wet days totalling 51.7mm. Demanding conditions — pack for it and plan indoor options.
April in Cedar Rapids averages a daily high of 17.3°C with nights around 4.1°C. Expect roughly 11.2 wet days totalling 100.4mm. Generally workable, with some weather to plan around.
May in Cedar Rapids averages a daily high of 23.1°C with nights around 10.3°C. Expect roughly 13 wet days totalling 121.3mm. Generally workable, with some weather to plan around.
June in Cedar Rapids averages a daily high of 28.1°C with nights around 15.9°C. Expect roughly 12.1 wet days totalling 145.5mm. Generally workable, with some weather to plan around.
July in Cedar Rapids averages a daily high of 29.6°C with nights around 18°C. Expect roughly 8.8 wet days totalling 98.2mm. Generally workable, with some weather to plan around.
August in Cedar Rapids averages a daily high of 28.7°C with nights around 16.9°C. Expect roughly 9.2 wet days totalling 103.8mm. Comfortable conditions for being outdoors all day.
September in Cedar Rapids averages a daily high of 25.6°C with nights around 12.4°C. Expect roughly 7.9 wet days totalling 90.3mm. Comfortable conditions for being outdoors all day.
October in Cedar Rapids averages a daily high of 18°C with nights around 5.8°C. Expect roughly 9.5 wet days totalling 85.3mm. Comfortable conditions for being outdoors all day.
November in Cedar Rapids averages a daily high of 9.3°C with nights around -0.8°C. Expect roughly 7.6 wet days totalling 51.3mm. Demanding conditions — pack for it and plan indoor options.
December in Cedar Rapids averages a daily high of 1.7°C with nights around -6.8°C. Expect roughly 9.2 wet days totalling 43.4mm. 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. Cedar Rapids peaks at 84.
Based on 30 years of records, September scores highest for comfort in Cedar Rapids, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 29.6°C.
June is the wettest, averaging 145.5mm of rain across roughly 12.1 wet days.
January is the coolest month, with average daily highs around -1.2°C.