Climate Chart of Harrisburg, USA

Climate overview

Temperature

Monthly mean temperatures are coolest in January, at -0.2 °C, and warmest in July, at 25.0 °C. These are averages for each month, not daytime highs, so they provide a broad guide to the temperature pattern rather than a prediction for a particular afternoon. Across the calendar months, the unweighted mean of the monthly means is 12.3 °C; it is not weighted by the number of days in each month.

Rain

Mean daily rainfall is lowest in January, at 1.75 mm/day, and highest in September, at 3.48 mm/day. The overall unweighted mean across monthly daily means is 2.74 mm/day. These are daily averages, not monthly rainfall totals, and they do not show how often rain falls or guarantee dry weather in the lower-average month; a light rain layer is still useful when planning outdoor activities.

Sunshine

Daily sunshine averages reach their highest level in July, at 11.30 hours/day, and their lowest in December, at 4.98 hours/day. The unweighted mean of the monthly daily averages is 8.16 hours/day. Sunshine duration can help with planning time outdoors, but it measures average sunshine rather than day length and cannot guarantee clear skies on a visit.

Snow

The highest monthly mean daily snowfall is recorded in February, at 6.24 mm/day; the unweighted mean across monthly daily means is 1.73 mm/day. These averages describe snowfall amounts, not the number of snowy days, snow depth or how long snow remains on the ground, so they cannot establish snow-cover or skiing conditions.