Average temperature in July is 25.3 °C
Average daytime temperature is 31.7 °C
Average night temperature is 20.5 °C
Absolute maximum temperature: 37.6 °C
Absolute minimum temperature: 17.7 °C
Number of sunny days: 7
Number of rainy days: 24
Number of snow days:
Precipitation sum: 134 mm
* Weather data for Fairfax United States is based on climate observations for 2023 year
| July (°C) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperature | 29.9 | 29.8 | 32.6 | 31.3 | 32.6 | 30.5 | 31 | 31.6 | 26.7 | 29.9 | 31.6 | 33.6 | 35.3 | 32.6 | 30.8 | 30.7 | 34 | 32.6 | 31.7 | 32 | 30.9 | 29.2 | 29.6 | 28.8 | 28.3 | 32.7 | 37.4 | 37.2 | 37.6 | 30.2 | 30 |
| Apparent max temperature | 33.8 | 34.3 | 37.2 | 34.6 | 37.1 | 34.6 | 36.2 | 37.2 | 30 | 32.4 | 33.3 | 35.4 | 37.6 | 37.4 | 36.3 | 35.4 | 35.3 | 35.3 | 36 | 36.6 | 32.5 | 30.2 | 32.3 | 32.1 | 32.9 | 35 | 38.5 | 41 | 39.5 | 31.1 | 30.8 |
| Mean temperature | 23.1 | 23.8 | 26.7 | 25.1 | 26.6 | 26 | 25.6 | 24.5 | 23.6 | 23.4 | 25.1 | 26.4 | 26.9 | 24.9 | 24.6 | 24.8 | 26.7 | 26.4 | 25.6 | 25.3 | 24.8 | 24 | 23.9 | 23.6 | 23.5 | 24.6 | 28.5 | 28.2 | 27.9 | 25.7 | 24 |
| Apparent mean temperature | 22 | 24.4 | 25.8 | 23.4 | 23.3 | 25 | 24.6 | 24.4 | 24.7 | 20.8 | 18.9 | 19.8 | 21.5 | 22.8 | 23.5 | 25.5 | 22.8 | 22.5 | 23.6 | 21.6 | 22.3 | 19.2 | 18.6 | 21.9 | 24.2 | 20.2 | 23.8 | 27 | 24.8 | 21.6 | 19.8 |
| Minimum temperature | 19.5 | 21.1 | 22.3 | 20.6 | 21.5 | 21.3 | 21.1 | 21.1 | 21.3 | 19 | 18.9 | 20 | 20.9 | 20 | 20.4 | 22.2 | 21 | 20.1 | 21.8 | 20.1 | 19.8 | 18.9 | 17.7 | 20.2 | 20.8 | 18.1 | 22.9 | 22.5 | 21.9 | 20.4 | 18.3 |
| Apparent min temperature | 26 | 27.7 | 30.2 | 28.6 | 29.8 | 30.1 | 29.8 | 28.4 | 27.3 | 25.9 | 26 | 27.2 | 28.4 | 28.5 | 28.7 | 29.1 | 29.2 | 28.5 | 28.7 | 28.4 | 27 | 24.7 | 25.3 | 25.9 | 27.3 | 27.6 | 30.7 | 32.5 | 30.8 | 26.6 | 24.9 |
| July | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight duration (h) | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.7 | 14.7 | 14.7 | 14.7 | 14.7 | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.5 | 14.5 | 14.5 | 14.5 | 14.4 | 14.4 | 14.4 | 14.4 | 14.3 | 14.3 | 14.3 | 14.2 | 14.2 |
| Sunshine duration (h) | 9.6 | 7.9 | 12.6 | 12.5 | 12.8 | 13.4 | 13.7 | 12.1 | 5.6 | 11 | 13.6 | 13.6 | 13.3 | 11.6 | 11.9 | 7.6 | 13.5 | 13.5 | 10.8 | 13.4 | 13.1 | 12.4 | 13.3 | 12.6 | 12 | 13.1 | 13.2 | 13.1 | 12.8 | 12.1 | 12.2 |
| Precipitation (mm) | 4.5 | 6.6 | 1.8 | 18.4 | 0.9 | 4 | 3.9 | 9.4 | 3.4 | 0.5 | 0 | 0 | 0 | 17 | 20.5 | 13.2 | 0.1 | 0 | 1 | 0 | 1 | 0 | 0.4 | 4.9 | 15.8 | 4.8 | 0.1 | 0.9 | 0.5 | 0 | 0.4 |
| Precipitation hours | 10 | 6 | 3 | 10 | 2 | 4 | 5 | 8 | 6 | 4 | 0 | 0 | 0 | 7 | 4 | 14 | 1 | 0 | 2 | 0 | 3 | 0 | 2 | 8 | 5 | 1 | 1 | 3 | 1 | 0 | 2 |
| Wind speed (m/s) | 12 | 15 | 16 | 10.7 | 10.5 | 8.9 | 9.9 | 15.9 | 10.5 | 16.8 | 11.7 | 13.1 | 16.8 | 15.5 | 14.3 | 14.3 | 14.7 | 10.4 | 10.1 | 11.6 | 15 | 13.1 | 9.9 | 13.1 | 10.6 | 9.9 | 19.1 | 14.4 | 24.2 | 22 | 11.5 |
In July 2023, the highest daytime temperature in Fairfax was 37.6°C.
While the minimum temperature at night dropped to 17.7°C.
The average nighttime and daytime temperatures during July in Fairfax are 20.5°C and 31.7°C respectively.
The precipitation sum in July is about 134 mm.