Longmont

What is the climate like in Longmont?

The best time to visit Longmont is typically June – October, with trip comfort peaking in September (8.6/10). Longmont is warmest in July, when daily highs average 89°F (32°C), and coolest in January, when lows fall to about 20°F (-7°C). The wettest month is typically May and the driest is December; the year sees roughly 20 in (501 mm) of precipitation.

• Best time to visitJune – October — comfort peaks in September (8.6/10)
• Warmest monthJuly — average high 89°F (32°C)
• Coolest monthJanuary — average low 20°F (-7°C)
• Wettest monthMay (4.3 in (108 mm))
• Driest monthDecember (0.7 in (19 mm))
• Annual precipitation20 in (501 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromLongmont 2 Ese, 2 km away (1893-2026)