Fairfax
United States · 9 July 2017
Average
24.6°C
low 19.7° · high 28.9°
Rainfall
0mm
dry day
Wind
2.2m/s
daily average
Humidity
59.6%
daily average
Cloud
21%
cover
Pressure
1017hPa
daily average
The temperature ranged from 19.7°C around 05:00 to 28.9°C around 18:00. No measurable rain was recorded during the day.
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
13th percentile
Low temperature
10th percentile
Rainfall
30th percentile
Wind
64th percentile
A percentile of 100 means this was the hottest/wettest/windiest of the comparable days on file; 50 is right in the middle. This window's average temperature was 26.9°C, versus 24.6°C on this specific day.
Sun & daylight
Sunrise
05:52
Sunset
20:35
Day length
14h 43m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/New_York.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 04:00 | 22.8 | 22.8 | 0 | 3.2 | NW | 68 | 1014 |
| 01:00 | 05:00 | 22.3 | 22.4 | 0 | 3.2 | NW | 71 | 1014 |
| 02:00 | 06:00 | 21 | 20.8 | 0 | 3.2 | NW | 74 | 1015 |
| 03:00 | 07:00 | 20.8 | 20.6 | 0 | 3.1 | NNW | 75 | 1015 |
| 04:00 | 08:00 | 20.3 | 20.3 | 0 | 2.9 | NW | 76 | 1015 |
| 05:00 | 09:00 | 19.7 | 19.7 | 0 | 2.8 | NW | 80 | 1015 |
| 06:00 | 10:00 | 20.5 | 20.7 | 0 | 2.5 | NNW | 74 | 1017 |
| 07:00 | 11:00 | 20.7 | 21.3 | 0 | 2.2 | NW | 75 | 1017 |
| 08:00 | 12:00 | 22 | 22.6 | 0 | 2.3 | NW | 71 | 1018 |
| 09:00 | 13:00 | 23.1 | 23.9 | 0 | 2.3 | NNW | 69 | 1018 |
| 10:00 | 14:00 | 24.3 | 25 | 0 | 2.3 | NNW | 63 | 1018 |
| 11:00 | 15:00 | 26.8 | 26.2 | 0 | 2.4 | NW | 43 | 1019 |
| 12:00 | 16:00 | 27.3 | 26.8 | 0 | 2.4 | NW | 44 | 1019 |
| 13:00 | 17:00 | 27.9 | 27.6 | 0 | 2.3 | NW | 42 | 1019 |
| 14:00 | 18:00 | 28.2 | 27.8 | 0 | 2.2 | WNW | 40 | 1018 |
| 15:00 | 19:00 | 28.6 | 28.3 | 0 | 2.2 | WNW | 40 | 1018 |
| 16:00 | 20:00 | 28.7 | 28.6 | 0 | 2 | WNW | 41 | 1018 |
| 17:00 | 21:00 | 28.9 | 29 | 0 | 1.9 | WNW | 42 | 1017 |
| 18:00 | 22:00 | 28.9 | 30 | 0 | 0.6 | WSW | 42 | 1017 |
| 19:00 | 23:00 | 27.9 | 29.7 | 0 | 0.8 | SSE | 51 | 1017 |
| 20:00 | 00:00 | 26.6 | 28.4 | 0 | 1.2 | SSE | 58 | 1017 |
| 21:00 | 01:00 | 25.5 | 26.6 | 0 | 1.5 | ESE | 57 | 1017 |
| 22:00 | 02:00 | 24.5 | 25.2 | 0 | 1.7 | ESE | 57 | 1018 |
| 23:00 | 03:00 | 22.8 | 24.4 | 0 | 1.9 | ESE | 76 | 1018 |
Nearby cities
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Data source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
- Source
- ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
- Data type
- Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
- Coverage
- 2016–2025 (10 years) for United States
- Location
- Fairfax — 38.750°, -77.250°, ERA5 grid cell center, 11.8 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 9 July 2017 specifically — not a monthly average. See the Fairfax climate overview for typical conditions.
- Spatial resolution
- 0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
- Version / refreshed
- Methodology v2026.07 · data last refreshed December 31, 2025
- Limitations
- A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
- Attribution
- Generated using Copernicus Climate Change Service information
Cite this data
PastClimate (2026-07-17). Historical climate data for Fairfax, United States (38.75°N, 77.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Fairfax, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Fairfax, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Fairfax, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-17},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.