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Roswell, New Mexico climate
BWk Cold desert
Roswell has a seasonal mild-temperate climate (Cold desert, Köppen BWk). The hottest month is July with an average daily high near 36°C, while the coldest is December averaging around −2°C at night. Precipitation totals about 295 mm a year and is strongly seasonal — July alone averages 46 mm while February barely receives 9 mm. Light snow accumulates each winter (24 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 countsRoswell climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 17 | 22 | 26 | 31 | 36 | 36 | 35 | 31 | 25 | 19 | 14 |
| Avg temp (°C) | 6 | 9 | 13 | 17 | 22 | 27 | 28 | 28 | 24 | 17 | 11 | 6 |
| Avg low (°C) | −2 | 0 | 4 | 8 | 14 | 19 | 21 | 20 | 16 | 9 | 2 | −2 |
| Precipitation (mm) | 9 | 9 | 14 | 14 | 29 | 33 | 46 | 43 | 39 | 34 | 11 | 14 |
| Snowfall (cm) | 6 | 3 | 2 | — | — | — | — | — | — | 1 | 3 | 10 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 17 | 22 | 26 | 31 | 36 |
| Avg temp (°C) | 6 | 9 | 13 | 17 | 22 | 27 |
| Avg low (°C) | −2 | 0 | 4 | 8 | 14 | 19 |
| Precipitation (mm) | 9 | 9 | 14 | 14 | 29 | 33 |
| Snowfall (cm) | 6 | 3 | 2 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 36 | 35 | 31 | 25 | 19 | 14 |
| Avg temp (°C) | 28 | 28 | 24 | 17 | 11 | 6 |
| Avg low (°C) | 21 | 20 | 16 | 9 | 2 | −2 |
| Precipitation (mm) | 46 | 43 | 39 | 34 | 11 | 14 |
| Snowfall (cm) | — | — | — | 1 | 3 | 10 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 3 | 3 | 3 | 4 | 5 | 7 | 7 | 6 | 5 | 3 | 4 |
| Days with high ≥ 32°C (days) | — | 0.0 | 0.5 | 3 | 14 | 25 | 27 | 24 | 13 | 3 | — | — |
| Days with low ≤ 0°C (days) | 25 | 17 | 7 | 1 | — | — | — | — | — | 1 | 12 | 24 |
| Days with snowfall ≥ 2.5 cm (days) | 0.6 | 0.3 | 0.1 | — | — | 0.0 | — | — | — | 0.1 | 0.3 | 0.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 3 | 3 | 3 | 4 | 5 |
| Days with high ≥ 32°C (days) | — | 0.0 | 0.5 | 3 | 14 | 25 |
| Days with low ≤ 0°C (days) | 25 | 17 | 7 | 1 | — | — |
| Days with snowfall ≥ 2.5 cm (days) | 0.6 | 0.3 | 0.1 | — | — | 0.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 7 | 6 | 5 | 3 | 4 |
| Days with high ≥ 32°C (days) | 27 | 24 | 13 | 3 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 1 | 12 | 24 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | 0.1 | 0.3 | 0.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 48 | 45 | 41 | 42 | 39 | 47 | 47 | 38 | 36 | 39 | 49 |
| Clear days (≤ 30% cloud) | 12 | 10 | 11 | 13 | 13 | 13 | 10 | 9 | 14 | 16 | 14 | 10 |
| Partly cloudy days (30–70%) | 11 | 10 | 12 | 10 | 12 | 12 | 14 | 14 | 10 | 8 | 9 | 12 |
| Cloudy days (≥ 70%) | 8 | 8 | 8 | 7 | 7 | 5 | 7 | 7 | 6 | 6 | 7 | 9 |
| Relative humidity (%) | 50 | 45 | 38 | 32 | 33 | 35 | 42 | 45 | 48 | 46 | 48 | 51 |
| Wind speed (km/h) | 10.3 | 11.5 | 12.2 | 13.2 | 12.1 | 11.6 | 10.0 | 8.9 | 9.4 | 9.6 | 9.5 | 9.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 48 | 45 | 41 | 42 | 39 |
| Clear days (≤ 30% cloud) | 12 | 10 | 11 | 13 | 13 | 13 |
| Partly cloudy days (30–70%) | 11 | 10 | 12 | 10 | 12 | 12 |
| Cloudy days (≥ 70%) | 8 | 8 | 8 | 7 | 7 | 5 |
| Relative humidity (%) | 50 | 45 | 38 | 32 | 33 | 35 |
| Wind speed (km/h) | 10.3 | 11.5 | 12.2 | 13.2 | 12.1 | 11.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 47 | 47 | 38 | 36 | 39 | 49 |
| Clear days (≤ 30% cloud) | 10 | 9 | 14 | 16 | 14 | 10 |
| Partly cloudy days (30–70%) | 14 | 14 | 10 | 8 | 9 | 12 |
| Cloudy days (≥ 70%) | 7 | 7 | 6 | 6 | 7 | 9 |
| Relative humidity (%) | 42 | 45 | 48 | 46 | 48 | 51 |
| Wind speed (km/h) | 10.0 | 8.9 | 9.4 | 9.6 | 9.5 | 9.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Roswell Ind Air PK (NOAA GHCN station USW00023009), about 10 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.