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Fairfax

United States · 9 July 2023

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Average

25°C

low 22.2° · high 29°

Rainfall

8.9mm

rain recorded

Wind

1.9m/s

daily average

Humidity

84.7%

daily average

Cloud

93%

cover

Pressure

1009hPa

daily average

The temperature ranged from 22.2°C around 23:00 to 29°C around 13:00. Rain was recorded across 9 hours, from around 10:00 to 20:00 (8.9mm total).

How unusual was this day?

Compared against the same 135 calendar days (±7 days) across the other 9 years on file.

High temperature

16th percentile

Low temperature

36th percentile

Rainfall

89th percentile

Wind

38th 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 25°C on this specific day.

Sun & daylight

Sunrise

05:52

Sunset

20:36

Day length

14h 44m

Hour by hour

Temperature (line) and hourly rainfall (bars), local time — America/New_York.

↓ Download CSV
00:0006:0012:0018:0023:00

Cumulative rainfall through the day.

00:0006:0012:0018:0023:00
Local timeUTCTemp °CFeels °CRain mmWind m/sDirHumidity %Pressure hPa
00:0004:0024.527.902.2S891010
01:0005:0024.327.802S881010
02:0006:0024.127.701.8S911009
03:0007:0024.127.80.011.7S911009
04:0008:0024.127.90.011.8S921009
05:0009:0024.1280.081.8SSE941009
06:0010:0023.827.50.012.1S941010
07:0011:0023.827.202.6S951009
08:0012:0024.427.902.4SSW921009
09:0013:002528.802S881009
10:0014:0026.230.30.251.8S831009
11:0015:0027.931.80.081.7SSE741009
12:0016:0028.532.30.091.9SSE711008
13:0017:002933.30.171.5S711008
14:0018:0028.932.61.771.8W691008
15:0019:0026.229.65.172NW781008
16:0020:0025.128.80.351.6NNW841008
17:0021:0024.4280.172NNW881008
18:0022:002527.70.222.4N801007
19:0023:0024.627.30.322.1NNE801008
20:0000:0023.826.50.191.9NNE821009
21:0001:0023.4260.021.8NNE841009
22:0002:00232601.4N861009
23:0003:0022.224.901.6N881008

Same date, other years

202520242022202120202019201820172016

Nearby cities

Dale City

0km away, same day

Lake Ridge

0km away, same day

Burke

0km away, same day

Annandale

0km away, same day

Springfield

0km away, same day

West Falls Church

0km away, same day

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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 2023 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

Plain text
PastClimate (2026-07-16). 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/
APA
PastClimate. (2026). Historical climate data for Fairfax, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 16, 2026, from https://www.pastclimate.com/
MLA
"Historical Climate Data for Fairfax, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 16, 2026, www.pastclimate.com.
BibTeX
@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 2026-07-16},
  url = {https://www.pastclimate.com/}
}

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