Home › Cities › United States › California › Porterville
Porterville, California climate
BSh Hot semi-arid
Porterville has a seasonal warm-temperate climate (Hot semi-arid, Köppen BSh). The hottest month is July with an average daily high near 37°C, while the coldest is December averaging around 4°C at night. Precipitation totals about 279 mm a year and is strongly seasonal — January alone averages 53 mm while August barely receives 0 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 countsPorterville climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 15 | 18 | 21 | 24 | 29 | 34 | 37 | 36 | 34 | 28 | 20 | 15 |
| Avg temp (°C) | 10 | 12 | 15 | 17 | 21 | 25 | 29 | 28 | 25 | 20 | 14 | 9 |
| Avg low (°C) | 4 | 6 | 8 | 10 | 14 | 17 | 20 | 19 | 17 | 12 | 7 | 4 |
| Precipitation (mm) | 53 | 49 | 52 | 24 | 9 | 3 | 1 | 0 | 2 | 14 | 24 | 49 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 15 | 18 | 21 | 24 | 29 | 34 |
| Avg temp (°C) | 10 | 12 | 15 | 17 | 21 | 25 |
| Avg low (°C) | 4 | 6 | 8 | 10 | 14 | 17 |
| Precipitation (mm) | 53 | 49 | 52 | 24 | 9 | 3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 37 | 36 | 34 | 28 | 20 | 15 |
| Avg temp (°C) | 29 | 28 | 25 | 20 | 14 | 9 |
| Avg low (°C) | 20 | 19 | 17 | 12 | 7 | 4 |
| Precipitation (mm) | 1 | 0 | 2 | 14 | 24 | 49 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 7 | 5 | 2 | 0.7 | 0.2 | 0.3 | 0.9 | 2 | 4 | 7 |
| Days with high ≥ 32°C (days) | — | — | 0.1 | 3 | 10 | 21 | 27 | 27 | 21 | 7 | — | — |
| Days with low ≤ 0°C (days) | 6 | 2 | 0.2 | 0.1 | 0.1 | — | — | 0.1 | — | — | 1 | 6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 7 | 5 | 2 | 0.7 |
| Days with high ≥ 32°C (days) | — | — | 0.1 | 3 | 10 | 21 |
| Days with low ≤ 0°C (days) | 6 | 2 | 0.2 | 0.1 | 0.1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.2 | 0.3 | 0.9 | 2 | 4 | 7 |
| Days with high ≥ 32°C (days) | 27 | 27 | 21 | 7 | — | — |
| Days with low ≤ 0°C (days) | — | 0.1 | — | — | 1 | 6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 52 | 46 | 38 | 30 | 19 | 16 | 13 | 16 | 26 | 43 | 56 |
| Clear days (≤ 30% cloud) | 6 | 9 | 12 | 14 | 19 | 24 | 26 | 27 | 24 | 21 | 12 | 7 |
| Partly cloudy days (30–70%) | 12 | 9 | 10 | 10 | 8 | 5 | 4 | 3 | 4 | 7 | 12 | 13 |
| Cloudy days (≥ 70%) | 13 | 10 | 9 | 6 | 4 | 2 | 1 | 0.9 | 2 | 3 | 7 | 11 |
| Relative humidity (%) | 60 | 64 | 63 | 59 | 50 | 35 | 28 | 27 | 31 | 39 | 49 | 57 |
| Wind speed (km/h) | 4.6 | 4.9 | 5.2 | 5.9 | 6.0 | 6.1 | 5.7 | 5.4 | 5.3 | 5.1 | 4.7 | 4.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 52 | 46 | 38 | 30 | 19 |
| Clear days (≤ 30% cloud) | 6 | 9 | 12 | 14 | 19 | 24 |
| Partly cloudy days (30–70%) | 12 | 9 | 10 | 10 | 8 | 5 |
| Cloudy days (≥ 70%) | 13 | 10 | 9 | 6 | 4 | 2 |
| Relative humidity (%) | 60 | 64 | 63 | 59 | 50 | 35 |
| Wind speed (km/h) | 4.6 | 4.9 | 5.2 | 5.9 | 6.0 | 6.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 16 | 13 | 16 | 26 | 43 | 56 |
| Clear days (≤ 30% cloud) | 26 | 27 | 24 | 21 | 12 | 7 |
| Partly cloudy days (30–70%) | 4 | 3 | 4 | 7 | 12 | 13 |
| Cloudy days (≥ 70%) | 1 | 0.9 | 2 | 3 | 7 | 11 |
| Relative humidity (%) | 28 | 27 | 31 | 39 | 49 | 57 |
| Wind speed (km/h) | 5.7 | 5.4 | 5.3 | 5.1 | 4.7 | 4.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Porterville (NOAA GHCN station USC00047077), inside the city.
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.