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Frederick, Maryland climate
Cfa Humid subtropical
Frederick 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 −3°C at night. Precipitation is fairly even year-round, totalling about 1050 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 countsFrederick climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 12 | 19 | 24 | 28 | 31 | 29 | 25 | 19 | 13 | 8 |
| Avg temp (°C) | 1 | 3 | 7 | 13 | 18 | 23 | 26 | 24 | 20 | 14 | 8 | 4 |
| Avg low (°C) | −3 | −2 | 2 | 8 | 13 | 18 | 20 | 19 | 16 | 9 | 3 | −1 |
| Precipitation (mm) | 79 | 66 | 93 | 82 | 90 | 101 | 101 | 77 | 102 | 89 | 83 | 86 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 12 | 19 | 24 | 28 |
| Avg temp (°C) | 1 | 3 | 7 | 13 | 18 | 23 |
| Avg low (°C) | −3 | −2 | 2 | 8 | 13 | 18 |
| Precipitation (mm) | 79 | 66 | 93 | 82 | 90 | 101 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 29 | 25 | 19 | 13 | 8 |
| Avg temp (°C) | 26 | 24 | 20 | 14 | 8 | 4 |
| Avg low (°C) | 20 | 19 | 16 | 9 | 3 | −1 |
| Precipitation (mm) | 101 | 77 | 102 | 89 | 83 | 86 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 8 | 11 | 10 | 11 | 10 | 9 | 6 | 9 | 8 | 8 | 9 |
| Days with high ≥ 32°C (days) | — | — | — | 0.2 | 2 | 4 | 9 | 5 | 0.8 | — | — | — |
| Days with low ≤ 0°C (days) | 22 | 20 | 13 | 2 | 0.1 | — | — | — | — | 0.4 | 8 | 19 |
| Days with snowfall ≥ 2.5 cm (days) | 2 | 2 | 0.8 | — | — | — | — | — | — | — | 0.2 | 0.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 8 | 11 | 10 | 11 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | 0.2 | 2 | 4 |
| Days with low ≤ 0°C (days) | 22 | 20 | 13 | 2 | 0.1 | — |
| Days with snowfall ≥ 2.5 cm (days) | 2 | 2 | 0.8 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 6 | 9 | 8 | 8 | 9 |
| Days with high ≥ 32°C (days) | 9 | 5 | 0.8 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.4 | 8 | 19 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | 0.2 | 0.5 |
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 (%) | 83 | 81 | 79 | 77 | 77 | 74 | 68 | 69 | 71 | 75 | 78 | 83 |
| Wind speed (mph) | 7.1 | 7.2 | 7.3 | 6.7 | 5.5 | 4.9 | 4.5 | 4.5 | 5.3 | 5.8 | 6.2 | 6.4 |
| 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 (%) | 83 | 81 | 79 | 77 | 77 | 74 |
| Wind speed (mph) | 7.1 | 7.2 | 7.3 | 6.7 | 5.5 | 4.9 |
| 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 | 69 | 71 | 75 | 78 | 83 |
| Wind speed (mph) | 4.5 | 4.5 | 5.3 | 5.8 | 6.2 | 6.4 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Rockville 1 NE (NOAA GHCN station USC00187705), about 42 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.