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McLean

United States · 6 July 2018

McLeanUnited States6:42 AM localChange location

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Average

26.6°C

low 24.6° · high 28.2°

Rainfall

5.7mm

rain recorded

Wind

2.6m/s

daily average

Humidity

81.4%

daily average

Cloud

96%

cover

Pressure

1019hPa

daily average

The temperature ranged from 24.6°C around 23:00 to 28.2°C around 17:00. Rain was recorded across 10 hours, from around 07:00 to 16:00 (5.7mm total).

How unusual was this day?

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

High temperature

10th percentile

Low temperature

95th percentile

Rainfall

79th percentile

Wind

76th 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 26.5°C, versus 26.6°C on this specific day.

Sun & daylight

Sunrise

05:49

Sunset

20:37

Day length

14h 48m

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
00:0004:0026.930.602.8S831021
01:0005:0026.630.302.9SSW841021
02:0006:0025.929.302.7SSW841021
03:0007:0025.628.902.9SSW851020
04:0008:0025.528.403.2SSW851020
05:0009:002528.102.9SW871020
06:0010:002528.40.012.6SSW891019
07:0011:0025.529.80.131.5SW881020
08:0012:0026.430.70.362.2WNW881019
09:0013:002731.10.233.1NW881020
10:0014:002731.40.272.5NW871020
11:0015:0027.431.40.382.2NW791020
12:0016:0026.829.90.633.2NW811020
13:0017:0026.930.20.563.3NNW831020
14:0018:0027.431.40.512.7NNW831019
15:0019:002833.10.262.2NNW861019
16:0020:002832.52.372.6NNW831018
17:0021:0028.23202.7N771018
18:0022:0027.632.501.9NNW841018
19:0023:0027.331.701.9N811018
20:0000:0027.230.702.3NNE761019
21:0001:0026.528.702.6NNE691019
22:0002:0026.12702.6N611020
23:0003:0024.624.703.2N621021

Same date, other years

202520242023202220212020201920172016

Nearby cities

Rockville

0km away, same day

Reston

0km away, same day

Potomac

0km away, same day

Oakton

0km away, same day

North Potomac

0km away, same day

Tysons

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
McLean — 39.000°, -77.250°, ERA5 grid cell center, 9.6 km from requested point
Time zone
America/New_York
What's shown here
The hourly and daily record for 6 July 2018 specifically — not a monthly average. See the McLean 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 (2026-07-17). Historical climate data for McLean, United States (39.00°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 McLean, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
MLA
"Historical Climate Data for McLean, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
BibTeX
@misc{pastclimate,
  author = {PastClimate},
  title = {Historical climate data for McLean, 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/}
}

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