Home / Chevy Chase / 21 July 2018
Chevy Chase
United States · 21 July 2018
Average
21.3°C
low 19.2° · high 23.9°
Rainfall
103.4mm
rain recorded
Wind
4.2m/s
daily average
Humidity
85.5%
daily average
Cloud
92%
cover
Pressure
1013hPa
daily average
The temperature ranged from 19.2°C around 23:00 to 23.9°C around 00:00. Rain was recorded across 17 hours, from around 07:00 to 23:00 (103.4mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
0th percentile
Low temperature
8th percentile
Rainfall
100th percentile
Wind
100th 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 27.2°C, versus 21.3°C on this specific day.
Sun & daylight
Sunrise
05:59
Sunset
20:29
Day length
14h 30m
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 | 23.9 | 24.2 | 0 | 3.3 | SE | 68 | 1017 |
| 01:00 | 05:00 | 23.8 | 24.4 | 0 | 2.9 | SE | 69 | 1017 |
| 02:00 | 06:00 | 23.1 | 23.9 | 0 | 2.6 | SE | 71 | 1017 |
| 03:00 | 07:00 | 22.6 | 23.4 | 0 | 2.4 | ESE | 72 | 1016 |
| 04:00 | 08:00 | 21.9 | 22.5 | 0 | 2.7 | ESE | 75 | 1016 |
| 05:00 | 09:00 | 21.5 | 21.9 | 0 | 3.1 | E | 78 | 1015 |
| 06:00 | 10:00 | 22.5 | 24 | 0 | 1.9 | E | 77 | 1015 |
| 07:00 | 11:00 | 22.5 | 23.4 | 0.6 | 2.9 | E | 78 | 1015 |
| 08:00 | 12:00 | 22.7 | 23.9 | 0.47 | 2.9 | E | 80 | 1015 |
| 09:00 | 13:00 | 22.6 | 24.2 | 2.06 | 3 | E | 85 | 1015 |
| 10:00 | 14:00 | 22.9 | 23.7 | 1.47 | 3.7 | E | 80 | 1015 |
| 11:00 | 15:00 | 21.9 | 22.2 | 2.75 | 3.9 | ENE | 82 | 1015 |
| 12:00 | 16:00 | 21.1 | 21.4 | 3.15 | 4.2 | NE | 88 | 1014 |
| 13:00 | 17:00 | 20.6 | 20.8 | 7.82 | 4.7 | NE | 94 | 1014 |
| 14:00 | 18:00 | 19.7 | 19.5 | 12.78 | 5.2 | NE | 98 | 1013 |
| 15:00 | 19:00 | 19.5 | 18.5 | 2.61 | 6.1 | NE | 96 | 1012 |
| 16:00 | 20:00 | 19.7 | 18.8 | 2.26 | 6 | NNE | 96 | 1011 |
| 17:00 | 21:00 | 19.8 | 19.4 | 3.17 | 5.5 | NNE | 97 | 1010 |
| 18:00 | 22:00 | 19.9 | 19.1 | 5.55 | 6 | NNE | 96 | 1009 |
| 19:00 | 23:00 | 20.3 | 19.4 | 6.6 | 6.2 | NE | 94 | 1008 |
| 20:00 | 00:00 | 20.1 | 19.3 | 8.47 | 5.8 | NE | 94 | 1008 |
| 21:00 | 01:00 | 19.7 | 18.8 | 11.01 | 5.5 | NNE | 92 | 1008 |
| 22:00 | 02:00 | 19.5 | 18.9 | 14.85 | 5.3 | N | 95 | 1007 |
| 23:00 | 03:00 | 19.2 | 18.8 | 17.74 | 5.2 | N | 98 | 1005 |
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
- Chevy Chase — 39.000°, -77.000°, ERA5 grid cell center, 7.5 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 21 July 2018 specifically — not a monthly average. See the Chevy Chase 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 (2026-07-16). Historical climate data for Chevy Chase, United States (39.00°N, 77.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Chevy Chase, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 16, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Chevy Chase, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 16, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Chevy Chase, 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/}
}Notice something wrong with this data? Report a data issue.