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Harrisburg, Pennsylvania climate
Cfa Humid subtropical
Harrisburg has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 31°C, while the coldest is January averaging around −4°C at night. Precipitation is fairly even year-round, totalling about 1041 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsHarrisburg climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 6 | 11 | 18 | 24 | 28 | 31 | 30 | 26 | 19 | 13 | 7 |
| Avg temp (°C) | 0 | 2 | 6 | 12 | 18 | 23 | 25 | 24 | 20 | 14 | 8 | 3 |
| Avg low (°C) | −4 | −3 | 1 | 6 | 12 | 17 | 20 | 19 | 15 | 8 | 3 | −1 |
| Precipitation (mm) | 67 | 60 | 85 | 94 | 88 | 94 | 109 | 93 | 105 | 93 | 71 | 80 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 6 | 11 | 18 | 24 | 28 |
| Avg temp (°C) | 0 | 2 | 6 | 12 | 18 | 23 |
| Avg low (°C) | −4 | −3 | 1 | 6 | 12 | 17 |
| Precipitation (mm) | 67 | 60 | 85 | 94 | 88 | 94 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 30 | 26 | 19 | 13 | 7 |
| Avg temp (°C) | 25 | 24 | 20 | 14 | 8 | 3 |
| Avg low (°C) | 20 | 19 | 15 | 8 | 3 | −1 |
| Precipitation (mm) | 109 | 93 | 105 | 93 | 71 | 80 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 10 | 12 | 13 | 11 | 11 | 11 | 9 | 10 | 8 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 1 | 4 | 10 | 6 | 2 | 0.1 | — | — |
| Days with low ≤ 0°C (days) | 24 | 22 | 15 | 3 | 0.0 | — | — | — | — | 1 | 9 | 21 |
| Days with snowfall ≥ 2.5 cm (days) | 0.0 | — | 0.1 | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 10 | 12 | 13 | 11 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 1 | 4 |
| Days with low ≤ 0°C (days) | 24 | 22 | 15 | 3 | 0.0 | — |
| Days with snowfall ≥ 2.5 cm (days) | 0.0 | — | 0.1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 11 | 9 | 10 | 8 | 10 |
| Days with high ≥ 32°C (days) | 10 | 6 | 2 | 0.1 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 1 | 9 | 21 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 67 | 66 | 65 | 65 | 61 | 57 | 57 | 57 | 59 | 64 | 69 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 6 | 5 | 5 | 7 | 7 | 8 | 7 | 5 | 3 |
| Partly cloudy days (30–70%) | 11 | 10 | 10 | 8 | 11 | 12 | 12 | 12 | 10 | 10 | 10 | 10 |
| Cloudy days (≥ 70%) | 16 | 15 | 16 | 16 | 15 | 13 | 11 | 12 | 12 | 13 | 15 | 17 |
| Relative humidity (%) | 86 | 84 | 81 | 78 | 78 | 74 | 68 | 68 | 71 | 77 | 81 | 85 |
| Wind speed (km/h) | 6.4 | 6.8 | 6.6 | 5.6 | 4.4 | 4.0 | 3.7 | 3.5 | 3.9 | 4.2 | 4.5 | 5.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 67 | 66 | 65 | 65 | 61 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 6 | 5 | 5 |
| Partly cloudy days (30–70%) | 11 | 10 | 10 | 8 | 11 | 12 |
| Cloudy days (≥ 70%) | 16 | 15 | 16 | 16 | 15 | 13 |
| Relative humidity (%) | 86 | 84 | 81 | 78 | 78 | 74 |
| Wind speed (km/h) | 6.4 | 6.8 | 6.6 | 5.6 | 4.4 | 4.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 57 | 57 | 59 | 64 | 69 |
| Clear days (≤ 30% cloud) | 7 | 7 | 8 | 7 | 5 | 3 |
| Partly cloudy days (30–70%) | 12 | 12 | 10 | 10 | 10 | 10 |
| Cloudy days (≥ 70%) | 11 | 12 | 12 | 13 | 15 | 17 |
| Relative humidity (%) | 68 | 68 | 71 | 77 | 81 | 85 |
| Wind speed (km/h) | 3.7 | 3.5 | 3.9 | 4.2 | 4.5 | 5.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Harrisburg Capital City AP (NOAA GHCN station USW00014751), about 7 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.