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Chambersburg, Pennsylvania climate
Cfa Humid subtropical
Chambersburg has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 85°F, while the coldest is January averaging around 23°F at night. Precipitation is fairly even year-round, totalling about 44 inches. Winters bring significant snowfall (31 inches of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 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 countsChambersburg climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 37 | 41 | 50 | 63 | 73 | 81 | 85 | 83 | 76 | 64 | 52 | 41 |
| Avg temp (°F) | 30 | 33 | 41 | 52 | 62 | 71 | 75 | 73 | 66 | 54 | 44 | 34 |
| Avg low (°F) | 23 | 25 | 32 | 42 | 52 | 61 | 65 | 63 | 56 | 45 | 35 | 27 |
| Precipitation (in) | 3.2 | 2.6 | 3.6 | 4.0 | 4.1 | 4.1 | 3.8 | 3.8 | 4.1 | 3.5 | 3.1 | 3.5 |
| Snowfall (in) | 10.0 | 8.0 | 6.0 | 0.3 | — | — | — | — | — | — | 1.0 | 5.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 37 | 41 | 50 | 63 | 73 | 81 |
| Avg temp (°F) | 30 | 33 | 41 | 52 | 62 | 71 |
| Avg low (°F) | 23 | 25 | 32 | 42 | 52 | 61 |
| Precipitation (in) | 3.2 | 2.6 | 3.6 | 4.0 | 4.1 | 4.1 |
| Snowfall (in) | 10.0 | 8.0 | 6.0 | 0.3 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 83 | 76 | 64 | 52 | 41 |
| Avg temp (°F) | 75 | 73 | 66 | 54 | 44 | 34 |
| Avg low (°F) | 65 | 63 | 56 | 45 | 35 | 27 |
| Precipitation (in) | 3.8 | 3.8 | 4.1 | 3.5 | 3.1 | 3.5 |
| Snowfall (in) | — | — | — | — | 1.0 | 5.5 |
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 | 9 | 11 | 12 | 11 | 9 | 9 | 9 | 8 | 7 | 9 |
| Days with high ≥ 90°F (days) | — | — | — | 0.1 | 1 | 4 | 7 | 4 | 1 | 0.1 | — | — |
| Days with low ≤ 32°F (days) | 24 | 22 | 16 | 5 | 0.3 | — | — | — | 0.0 | 2 | 11 | 22 |
| Days with snowfall ≥ 1 in (days) | 2 | 2 | 1 | 0.1 | — | — | — | — | — | 0.0 | 0.3 | 1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 9 | 11 | 12 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | 0.1 | 1 | 4 |
| Days with low ≤ 32°F (days) | 24 | 22 | 16 | 5 | 0.3 | — |
| Days with snowfall ≥ 1 in (days) | 2 | 2 | 1 | 0.1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 9 | 8 | 7 | 9 |
| Days with high ≥ 90°F (days) | 7 | 4 | 1 | 0.1 | — | — |
| Days with low ≤ 32°F (days) | — | — | 0.0 | 2 | 11 | 22 |
| Days with snowfall ≥ 1 in (days) | — | — | — | 0.0 | 0.3 | 1 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 65 | 65 | 64 | 65 | 64 | 59 | 56 | 55 | 55 | 54 | 61 | 65 |
| Clear days (≤ 30% cloud) | 4 | 4 | 5 | 6 | 6 | 5 | 7 | 8 | 8 | 9 | 6 | 5 |
| Partly cloudy days (30–70%) | 11 | 9 | 10 | 9 | 10 | 12 | 12 | 12 | 10 | 10 | 10 | 11 |
| Cloudy days (≥ 70%) | 15 | 15 | 15 | 16 | 15 | 12 | 12 | 11 | 12 | 12 | 14 | 15 |
| Relative humidity (%) | 87 | 85 | 82 | 78 | 78 | 74 | 68 | 68 | 71 | 76 | 81 | 86 |
| Wind speed (mph) | 3.3 | 3.5 | 3.3 | 2.7 | 2.1 | 1.9 | 1.8 | 1.7 | 1.9 | 2.0 | 2.1 | 2.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 65 | 65 | 64 | 65 | 64 | 59 |
| Clear days (≤ 30% cloud) | 4 | 4 | 5 | 6 | 6 | 5 |
| Partly cloudy days (30–70%) | 11 | 9 | 10 | 9 | 10 | 12 |
| Cloudy days (≥ 70%) | 15 | 15 | 15 | 16 | 15 | 12 |
| Relative humidity (%) | 87 | 85 | 82 | 78 | 78 | 74 |
| Wind speed (mph) | 3.3 | 3.5 | 3.3 | 2.7 | 2.1 | 1.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 55 | 55 | 54 | 61 | 65 |
| Clear days (≤ 30% cloud) | 7 | 8 | 8 | 9 | 6 | 5 |
| Partly cloudy days (30–70%) | 12 | 12 | 10 | 10 | 10 | 11 |
| Cloudy days (≥ 70%) | 12 | 11 | 12 | 12 | 14 | 15 |
| Relative humidity (%) | 68 | 68 | 71 | 76 | 81 | 86 |
| Wind speed (mph) | 1.8 | 1.7 | 1.9 | 2.0 | 2.1 | 2.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Chambersburg 1 Ese (NOAA GHCN station USC00361354), about 2 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.