Grinnell

What is the climate like in Grinnell?

The best time to visit Grinnell is typically June – September, with trip comfort peaking in August (6.9/10). Grinnell is warmest in July, when daily highs average 84°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 February; the year sees roughly 39 in (983 mm) of precipitation.

• Best time to visitJune – September — comfort peaks in August (6.9/10)
• Warmest monthJuly — average high 84°F (29°C)
• Coolest monthJanuary — average low 16°F (-9°C)
• Wettest monthMay (5.5 in (140 mm))
• Driest monthFebruary (1.5 in (37 mm))
• Annual precipitation39 in (983 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromGrinnell 3 Sw, 4 km away (1893-2026)