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Atascadero, California climate
Csa Hot-summer Mediterranean
Atascadero has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is August with an average daily high near 33°C, while the coldest is December averaging around 0°C at night. Precipitation totals about 388 mm a year and is strongly seasonal — January alone averages 87 mm while August barely receives 1 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 countsAtascadero climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 18 | 20 | 23 | 26 | 30 | 33 | 33 | 32 | 27 | 21 | 16 |
| Avg temp (°C) | 9 | 10 | 12 | 14 | 17 | 20 | 22 | 22 | 21 | 17 | 12 | 8 |
| Avg low (°C) | 1 | 3 | 4 | 5 | 8 | 10 | 12 | 11 | 10 | 6 | 3 | 0 |
| Precipitation (mm) | 87 | 82 | 72 | 21 | 9 | 1 | 3 | 1 | 2 | 17 | 29 | 64 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 18 | 20 | 23 | 26 | 30 |
| Avg temp (°C) | 9 | 10 | 12 | 14 | 17 | 20 |
| Avg low (°C) | 1 | 3 | 4 | 5 | 8 | 10 |
| Precipitation (mm) | 87 | 82 | 72 | 21 | 9 | 1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 33 | 32 | 27 | 21 | 16 |
| Avg temp (°C) | 22 | 22 | 21 | 17 | 12 | 8 |
| Avg low (°C) | 12 | 11 | 10 | 6 | 3 | 0 |
| Precipitation (mm) | 3 | 1 | 2 | 17 | 29 | 64 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 9 | 8 | 4 | 2 | 0.5 | 0.3 | 0.2 | 0.7 | 2 | 4 | 8 |
| Days with high ≥ 32°C (days) | — | — | 0.2 | 1 | 5 | 12 | 17 | 20 | 16 | 6 | 0.3 | — |
| Days with low ≤ 0°C (days) | 14 | 9 | 3 | 1 | — | — | — | — | — | 0.7 | 8 | 18 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 9 | 8 | 4 | 2 | 0.5 |
| Days with high ≥ 32°C (days) | — | — | 0.2 | 1 | 5 | 12 |
| Days with low ≤ 0°C (days) | 14 | 9 | 3 | 1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.3 | 0.2 | 0.7 | 2 | 4 | 8 |
| Days with high ≥ 32°C (days) | 17 | 20 | 16 | 6 | 0.3 | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.7 | 8 | 18 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 49 | 46 | 37 | 32 | 24 | 21 | 20 | 22 | 27 | 38 | 49 |
| Clear days (≤ 30% cloud) | 11 | 10 | 12 | 14 | 18 | 22 | 25 | 26 | 23 | 21 | 14 | 11 |
| Partly cloudy days (30–70%) | 10 | 9 | 10 | 10 | 9 | 6 | 5 | 4 | 6 | 6 | 9 | 11 |
| Cloudy days (≥ 70%) | 11 | 10 | 9 | 5 | 4 | 2 | 1 | 1.0 | 2 | 4 | 6 | 9 |
| Relative humidity (%) | 76 | 77 | 76 | 70 | 62 | 53 | 52 | 51 | 52 | 56 | 65 | 73 |
| Wind speed (km/h) | 8.2 | 8.6 | 8.4 | 9.2 | 9.4 | 9.4 | 8.7 | 8.0 | 7.4 | 7.5 | 7.8 | 8.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 49 | 46 | 37 | 32 | 24 |
| Clear days (≤ 30% cloud) | 11 | 10 | 12 | 14 | 18 | 22 |
| Partly cloudy days (30–70%) | 10 | 9 | 10 | 10 | 9 | 6 |
| Cloudy days (≥ 70%) | 11 | 10 | 9 | 5 | 4 | 2 |
| Relative humidity (%) | 76 | 77 | 76 | 70 | 62 | 53 |
| Wind speed (km/h) | 8.2 | 8.6 | 8.4 | 9.2 | 9.4 | 9.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 21 | 20 | 22 | 27 | 38 | 49 |
| Clear days (≤ 30% cloud) | 25 | 26 | 23 | 21 | 14 | 11 |
| Partly cloudy days (30–70%) | 5 | 4 | 6 | 6 | 9 | 11 |
| Cloudy days (≥ 70%) | 1 | 1.0 | 2 | 4 | 6 | 9 |
| Relative humidity (%) | 52 | 51 | 52 | 56 | 65 | 73 |
| Wind speed (km/h) | 8.7 | 8.0 | 7.4 | 7.5 | 7.8 | 8.4 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Paso Robles (NOAA GHCN station USC00046730), about 15 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.