Weather Reports for the city of Port Costa in California
snow
rain
temp
wind
humidity| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Average High (°F) | 56.6 | 61.7 | 64.3 | 67.6 | 69.7 | 77.7 |
| Average Low (°F) | 44.6 | 47.1 | 49.3 | 51.2 | 53.5 | 57.6 |
| All Time High (°F) | 74.8 | 76.1 | 79.7 | 85.3 | 91.8 | 98.2 |
| All Time Low (°F) | 29.8 | 32.4 | 38.5 | 38.8 | 45.5 | 48.6 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Average High (°F) | 79.4 | 80.1 | 80.3 | 74.9 | 62.5 | 56.7 |
| Average Low (°F) | 59.7 | 60.9 | 60.3 | 56.9 | 48.6 | 44.0 |
| All Time High (°F) | 93.2 | 97.9 | 102.6 | 93.7 | 81.3 | 74.1 |
| All Time Low (°F) | 54.1 | 55.2 | 41.7 | 45.7 | 36.9 | 34.0 |
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Percent of Rainy Days | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Avg. Rainfall (in) on Rainy Day | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| All Time Rainfall (in) on Rainy Day | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 30 Day Rain Accumulation | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| All Time 30 Day Rain Accumulation | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Percent of Rainy Days | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Avg. Rainfall (in) on Rainy Day | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| All Time Rainfall (in) on Rainy Day | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 30 Day Rain Accumulation | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| All Time 30 Day Rain Accumulation | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Percent of Days with Snowfall | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Avg. Snowfall Depth (in) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 30 Day Snowfall Total (in) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| All Time Snowfall Depth (in) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| All Time 30 Day Snowfall Total (in) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Percent of Days with Snowfall | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Avg. Snowfall Depth (in) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 30 Day Snowfall Total (in) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| All Time Snowfall Depth (in) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| All Time 30 Day Snowfall Total (in) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
Instead of using humidity directly we use dew point to measure what people commonly mean when saying it feels humid. Dew point is classified into 4 categories: Dry (under 25°F), Comfortable (25°F to 60°F), Muggy (60°F to 70°F) and Oppressive (70°F or greater). The table below shows the percentage of days with a dew point within a particular class.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Dry | 0.0 | 3.7 | 0.0 | 0.0 | 0.0 | 0.0 |
| Comfortable | 100.0 | 96.3 | 100.0 | 100.0 | 100.0 | 100.0 |
| Muggy | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Oppressive | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Dry | 0.0 | 0.0 | 0.0 | 0.0 | 3.6 | 0.0 |
| Comfortable | 96.8 | 100.0 | 100.0 | 96.8 | 96.4 | 100.0 |
| Muggy | 3.2 | 0.0 | 0.0 | 3.2 | 0.0 | 0.0 |
| Oppressive | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
The table below shows the distribution of average wind speeds in miles per hour for a given month or day. Wind speed may vary throughout a day and we show the average speed. Peak gusts or sustained maximum speeds may be significantly higher.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| 10th | 2.2 | 2.2 | 2.2 | 3.4 | 4.6 | 4.7 |
| 25th | 3.1 | 3.4 | 4.0 | 5.1 | 7.5 | 8.1 |
| 50th | 4.7 | 5.3 | 6.2 | 8.1 | 10.7 | 11.1 |
| 75th | 7.2 | 8.1 | 9.2 | 11.4 | 13.4 | 14.1 |
| 90th | 10.2 | 11.5 | 12.1 | 14.3 | 15.9 | 16.7 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| 10th | 8.1 | 5.8 | 2.6 | 2.2 | 2.2 | 2.2 |
| 25th | 10.3 | 9.0 | 4.8 | 3.4 | 3.1 | 3.4 |
| 50th | 12.9 | 11.9 | 8.3 | 5.5 | 4.7 | 4.7 |
| 75th | 15.8 | 14.6 | 11.9 | 8.5 | 7.0 | 7.4 |
| 90th | 18.0 | 16.7 | 14.6 | 11.4 | 9.8 | 11.0 |
The table below shows the distribution of wind direction (wind coming out of a particular direction) for a given month or day. Wind direction may vary throughout a day and the computation accounts for all measured changes in direction througout the day or month.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| North | 4.6 | 6.0 | 3.9 | 2.5 | 1.1 | 0.5 |
| NorthEast | 14.8 | 7.6 | 5.6 | 2.0 | 0.6 | 0.4 |
| East | 31.0 | 13.3 | 7.3 | 1.8 | 0.4 | 0.4 |
| SouthEast | 5.7 | 4.4 | 3.1 | 1.0 | 0.4 | 0.1 |
| South | 11.6 | 14.6 | 12.2 | 6.3 | 4.1 | 3.0 |
| SouthWest | 13.3 | 19.6 | 24.2 | 27.9 | 34.6 | 32.4 |
| West | 14.0 | 25.7 | 34.2 | 48.4 | 51.1 | 53.4 |
| NorthWest | 4.9 | 8.7 | 9.4 | 10.2 | 7.7 | 9.7 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| North | 0.1 | 0.3 | 1.2 | 4.6 | 5.6 | 7.2 |
| NorthEast | 0.0 | 0.2 | 1.6 | 5.5 | 9.7 | 15.1 |
| East | 0.0 | 0.1 | 1.3 | 6.7 | 20.2 | 28.2 |
| SouthEast | 0.0 | 0.1 | 0.5 | 2.3 | 5.7 | 6.7 |
| South | 1.5 | 1.4 | 3.9 | 9.1 | 13.1 | 11.7 |
| SouthWest | 31.3 | 32.0 | 30.0 | 25.0 | 17.8 | 12.1 |
| West | 56.3 | 55.5 | 49.9 | 35.5 | 19.6 | 13.1 |
| NorthWest | 10.6 | 10.5 | 11.6 | 11.2 | 8.2 | 5.8 |