Climate almanac
Harlan
Iowa, United States · 41.65°, -95.33°
What is the climate like in Harlan?
The best time to visit Harlan is typically June – September, with trip comfort peaking in September (7.3/10). Harlan is warmest in July, when daily highs average 85°F (29°C), and coolest in January, when lows fall to about 16°F (-9°C). The wettest month is typically May and the driest is January; the year sees roughly 37 in (937 mm) of precipitation.
- Best time to visitJune – September — comfort peaks in September (7.3/10)
- Warmest monthJuly — average high 85°F (29°C)
- Coolest monthJanuary — average low 16°F (-9°C)
- Wettest monthMay (6.0 in (152 mm))
- Driest monthJanuary (1.3 in (32 mm))
- Annual precipitation37 in (937 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromAudubon, 34 km away (1893-2026)