Harlan, IA
Climate overview — based on NOAA 1991-2020 normals from HARLAN, IA US.
Year-round temperatures (°F)
Climate summary
Harlan has an annual average temperature of 49.5°F with about 34.3 inches of precipitation per year and 30.5 inches of snow. The warmest month is July (average high 85.9°F), and the coldest is January (average low 10.3°F). June is typically the wettest month (5.17 in) and January the driest (0.90 in). Snow typically falls from October through April.
Best time to visit Harlan
Full guide →Climate change signal
All-time records →2 of 366 (0.5%) of Harlan'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 | 3 | |
| 1900s | 19 | |
| 1910s | 26 | |
| 1920s | 23 | |
| 1930s | 112 | |
| 1940s | 25 | |
| 1950s | 32 | |
| 1960s | 13 | |
| 1970s | 13 | |
| 1980s | 32 | |
| 1990s | 21 | |
| 2000s | 28 | |
| 2010s | 19 |
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 | 30.7°F | 10.3°F | 20.5°F | 0.90 in | 7.6 in | 6 |
| February | 35.7°F | 13.7°F | 24.7°F | 0.98 in | 7.6 in | 7 |
| March | 49.9°F | 25.3°F | 37.6°F | 2.05 in | 4.0 in | 7 |
| April | 63.3°F | 36.4°F | 49.8°F | 3.34 in | 1.5 in | 11 |
| May | 74.1°F | 49.3°F | 61.7°F | 4.74 in | — | 12 |
| June | 83.6°F | 59.9°F | 71.7°F | 5.17 in | — | 11 |
| July | 85.9°F | 63.6°F | 74.7°F | 3.72 in | — | 9 |
| August | 84.0°F | 60.8°F | 72.4°F | 4.32 in | — | 9 |
| September | 78.5°F | 51.7°F | 65.1°F | 4.00 in | — | 7 |
| October | 65.4°F | 39.1°F | 52.2°F | 2.37 in | 0.9 in | 8 |
| November | 49.3°F | 25.9°F | 37.6°F | 1.43 in | 2.2 in | 6 |
| December | 35.9°F | 15.7°F | 25.8°F | 1.31 in | 6.7 in | 6 |
Climate twins of Harlan
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).