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Romans-sur-Isère, Auvergne-Rhône-Alpes climate
Cfa Humid subtropical
Romans-sur-Isère 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. Around 921 mm of precipitation falls each year, peaking in October (133 mm) and easing off in February (43 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 countsRomans-sur-Isère climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 11 | 15 | 18 | 22 | 27 | 30 | 30 | 24 | 19 | 13 | 9 |
| Avg temp (°C) | 6 | 7 | 10 | 13 | 17 | 21 | 24 | 23 | 19 | 15 | 10 | 6 |
| Avg low (°C) | 3 | 3 | 5 | 8 | 12 | 15 | 18 | 17 | 14 | 11 | 6 | 3 |
| Precipitation (mm) | 69 | 43 | 49 | 75 | 78 | 57 | 55 | 56 | 116 | 133 | 129 | 62 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 11 | 15 | 18 | 22 | 27 |
| Avg temp (°C) | 6 | 7 | 10 | 13 | 17 | 21 |
| Avg low (°C) | 3 | 3 | 5 | 8 | 12 | 15 |
| Precipitation (mm) | 69 | 43 | 49 | 75 | 78 | 57 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 24 | 19 | 13 | 9 |
| Avg temp (°C) | 24 | 23 | 19 | 15 | 10 | 6 |
| Avg low (°C) | 18 | 17 | 14 | 11 | 6 | 3 |
| Precipitation (mm) | 55 | 56 | 116 | 133 | 129 | 62 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 11 | 11 | 8 | 7 | 7 | 9 | 14 | 13 | 11 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.2 | 4 | 11 | 10 | 1 | — | — | — |
| Days with low ≤ 0°C (days) | 8 | 8 | 2 | 0.1 | — | — | — | — | — | 0.1 | 2 | 6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 11 | 11 | 8 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.2 | 4 |
| Days with low ≤ 0°C (days) | 8 | 8 | 2 | 0.1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 7 | 9 | 14 | 13 | 11 |
| Days with high ≥ 32°C (days) | 11 | 10 | 1 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.1 | 2 | 6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 59 | 58 | 61 | 61 | 52 | 43 | 45 | 50 | 62 | 64 | 62 |
| Clear days (≤ 30% cloud) | 6 | 6 | 8 | 7 | 6 | 8 | 12 | 11 | 10 | 6 | 5 | 5 |
| Partly cloudy days (30–70%) | 12 | 11 | 11 | 9 | 10 | 12 | 13 | 12 | 10 | 10 | 11 | 12 |
| Cloudy days (≥ 70%) | 14 | 11 | 13 | 14 | 14 | 9 | 6 | 8 | 10 | 15 | 15 | 14 |
| Relative humidity (%) | 86 | 82 | 78 | 74 | 71 | 64 | 55 | 55 | 66 | 78 | 85 | 87 |
| Wind speed (m/s) | 2.9 | 3.1 | 3.1 | 3.1 | 2.9 | 2.8 | 2.8 | 2.7 | 2.7 | 2.7 | 2.9 | 2.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 59 | 58 | 61 | 61 | 52 |
| Clear days (≤ 30% cloud) | 6 | 6 | 8 | 7 | 6 | 8 |
| Partly cloudy days (30–70%) | 12 | 11 | 11 | 9 | 10 | 12 |
| Cloudy days (≥ 70%) | 14 | 11 | 13 | 14 | 14 | 9 |
| Relative humidity (%) | 86 | 82 | 78 | 74 | 71 | 64 |
| Wind speed (m/s) | 2.9 | 3.1 | 3.1 | 3.1 | 2.9 | 2.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 43 | 45 | 50 | 62 | 64 | 62 |
| Clear days (≤ 30% cloud) | 12 | 11 | 10 | 6 | 5 | 5 |
| Partly cloudy days (30–70%) | 13 | 12 | 10 | 10 | 11 | 12 |
| Cloudy days (≥ 70%) | 6 | 8 | 10 | 15 | 15 | 14 |
| Relative humidity (%) | 55 | 55 | 66 | 78 | 85 | 87 |
| Wind speed (m/s) | 2.8 | 2.7 | 2.7 | 2.7 | 2.9 | 2.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Montelimar, a weather station, about 58 km from the city centre. The underlying daily records come from NOAA's global station network.
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.