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Morristown, Tennessee climate
Cfa Humid subtropical
Morristown has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 30°C, while the coldest is January averaging around −3°C at night. Precipitation is fairly even year-round, totalling about 1223 mm. Light snow accumulates each winter (22 cm 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 countsMorristown climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 10 | 15 | 21 | 25 | 29 | 30 | 30 | 27 | 21 | 15 | 9 |
| Avg temp (°C) | 3 | 5 | 9 | 14 | 19 | 23 | 25 | 24 | 21 | 15 | 8 | 4 |
| Avg low (°C) | −3 | −1 | 2 | 7 | 13 | 17 | 19 | 18 | 15 | 8 | 2 | −1 |
| Precipitation (mm) | 103 | 114 | 124 | 113 | 95 | 115 | 120 | 85 | 82 | 70 | 86 | 116 |
| Snowfall (cm) | 5 | 7 | 5 | — | — | — | — | — | — | — | 1 | 4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 10 | 15 | 21 | 25 | 29 |
| Avg temp (°C) | 3 | 5 | 9 | 14 | 19 | 23 |
| Avg low (°C) | −3 | −1 | 2 | 7 | 13 | 17 |
| Precipitation (mm) | 103 | 114 | 124 | 113 | 95 | 115 |
| Snowfall (cm) | 5 | 7 | 5 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 27 | 21 | 15 | 9 |
| Avg temp (°C) | 25 | 24 | 21 | 15 | 8 | 4 |
| Avg low (°C) | 19 | 18 | 15 | 8 | 2 | −1 |
| Precipitation (mm) | 120 | 85 | 82 | 70 | 86 | 116 |
| Snowfall (cm) | — | — | — | — | 1 | 4 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 12 | 13 | 11 | 12 | 12 | 12 | 10 | 9 | 9 | 9 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | 0.0 | 0.2 | 4 | 8 | 6 | 3 | 0.1 | — | — |
| Days with low ≤ 0°C (days) | 18 | 15 | 9 | 2 | 0.0 | — | — | — | — | 2 | 10 | 16 |
| Days with snowfall ≥ 2.5 cm (days) | 1 | 0.8 | 0.4 | — | — | — | — | — | — | — | 0.1 | 0.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 12 | 13 | 11 | 12 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | 0.0 | 0.2 | 4 |
| Days with low ≤ 0°C (days) | 18 | 15 | 9 | 2 | 0.0 | — |
| Days with snowfall ≥ 2.5 cm (days) | 1 | 0.8 | 0.4 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 10 | 9 | 9 | 9 | 12 |
| Days with high ≥ 32°C (days) | 8 | 6 | 3 | 0.1 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 2 | 10 | 16 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | 0.1 | 0.4 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 71 | 67 | 63 | 62 | 59 | 61 | 55 | 52 | 51 | 58 | 69 |
| Clear days (≤ 30% cloud) | 4 | 4 | 5 | 6 | 6 | 6 | 5 | 8 | 10 | 11 | 8 | 5 |
| Partly cloudy days (30–70%) | 9 | 7 | 9 | 10 | 10 | 12 | 12 | 13 | 10 | 10 | 9 | 9 |
| Cloudy days (≥ 70%) | 18 | 17 | 17 | 14 | 15 | 12 | 13 | 11 | 11 | 11 | 13 | 18 |
| Relative humidity (%) | 83 | 82 | 80 | 78 | 78 | 76 | 74 | 71 | 69 | 71 | 75 | 82 |
| Wind speed (km/h) | 2.8 | 3.1 | 2.9 | 2.6 | 2.1 | 1.9 | 1.8 | 1.8 | 1.9 | 2.1 | 2.2 | 2.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 71 | 67 | 63 | 62 | 59 |
| Clear days (≤ 30% cloud) | 4 | 4 | 5 | 6 | 6 | 6 |
| Partly cloudy days (30–70%) | 9 | 7 | 9 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 18 | 17 | 17 | 14 | 15 | 12 |
| Relative humidity (%) | 83 | 82 | 80 | 78 | 78 | 76 |
| Wind speed (km/h) | 2.8 | 3.1 | 2.9 | 2.6 | 2.1 | 1.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 55 | 52 | 51 | 58 | 69 |
| Clear days (≤ 30% cloud) | 5 | 8 | 10 | 11 | 8 | 5 |
| Partly cloudy days (30–70%) | 12 | 13 | 10 | 10 | 9 | 9 |
| Cloudy days (≥ 70%) | 13 | 11 | 11 | 11 | 13 | 18 |
| Relative humidity (%) | 74 | 71 | 69 | 71 | 75 | 82 |
| Wind speed (km/h) | 1.8 | 1.8 | 1.9 | 2.1 | 2.2 | 2.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Morristown Radio Wcrk (NOAA GHCN station USC00406271), about 3 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.