Diagonal, IA
Climate overview — based on NOAA 1991-2020 normals from MT AYR, IA US.
Year-round temperatures (°F)
Climate summary
Diagonal has an annual average temperature of 49.6°F with about 37 inches of precipitation per year and 20.5 inches of snow. The warmest month is July (average high 84.6°F), and the coldest is January (average low 11.7°F). June is typically the wettest month (5.39 in) and January the driest (0.73 in). Snow typically falls from October through April.
Best time to visit Diagonal
Full guide →Climate change signal
All-time records →27 of 366 (7.4%) of Diagonal's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 26 | |
| 1900s | 26 | |
| 1910s | 45 | |
| 1920s | 20 | |
| 1930s | 91 | |
| 1940s | 19 | |
| 1950s | 29 | |
| 1960s | 13 | |
| 1970s | 8 | |
| 1980s | 23 | |
| 1990s | 11 | |
| 2000s | 17 | |
| 2010s | 22 | |
| 2020s | 16 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 31.9°F | 11.7°F | 21.8°F | 0.73 in | 5.8 in | 4 |
| February | 36.8°F | 16.1°F | 26.5°F | 1.25 in | 5.9 in | 5 |
| March | 49.4°F | 27.5°F | 38.5°F | 2.16 in | 2.6 in | 6 |
| April | 61.4°F | 38.0°F | 49.7°F | 3.37 in | 0.7 in | 9 |
| May | 70.8°F | 49.7°F | 60.2°F | 5.35 in | — | 11 |
| June | 80.3°F | 59.6°F | 70.0°F | 5.39 in | — | 9 |
| July | 84.6°F | 63.9°F | 74.2°F | 4.40 in | — | 8 |
| August | 83.3°F | 61.8°F | 72.5°F | 3.98 in | — | 8 |
| September | 76.4°F | 52.7°F | 64.5°F | 3.71 in | — | 7 |
| October | 64.1°F | 40.2°F | 52.1°F | 2.88 in | 0.3 in | 7 |
| November | 49.0°F | 27.9°F | 38.4°F | 2.11 in | 1.2 in | 5 |
| December | 36.8°F | 17.7°F | 27.2°F | 1.63 in | 4.0 in | 5 |
Climate twins of Diagonal
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).