Home / Washington / 21 July 2017
Washington
United States · 21 July 2017
Average
30.1°C
low 25.6° · high 34.3°
Rainfall
0.1mm
dry day
Wind
1.5m/s
daily average
Humidity
60.6%
daily average
Cloud
70%
cover
Pressure
1013hPa
daily average
The temperature ranged from 25.6°C around 05:00 to 34.3°C around 15:00. 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
75th percentile
Low temperature
97th percentile
Rainfall
41th percentile
Wind
14th 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°C, versus 30.1°C on this specific day.
Sun & daylight
Sunrise
05:59
Sunset
20:28
Day length
14h 29m
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 | 27.6 | 30.8 | 0 | 1.5 | WSW | 68 | 1013 |
| 01:00 | 05:00 | 27 | 29.7 | 0 | 1.9 | W | 69 | 1014 |
| 02:00 | 06:00 | 26.4 | 28.4 | 0 | 2.1 | WNW | 67 | 1013 |
| 03:00 | 07:00 | 26.2 | 28.3 | 0 | 2.2 | WNW | 68 | 1013 |
| 04:00 | 08:00 | 25.9 | 27.9 | 0 | 2.5 | WNW | 69 | 1013 |
| 05:00 | 09:00 | 25.6 | 27.5 | 0 | 2.7 | NW | 73 | 1013 |
| 06:00 | 10:00 | 25.7 | 28.2 | 0 | 1.9 | NW | 72 | 1013 |
| 07:00 | 11:00 | 26.3 | 28.7 | 0 | 2.2 | NW | 71 | 1014 |
| 08:00 | 12:00 | 27.9 | 31.2 | 0 | 1.7 | NW | 69 | 1015 |
| 09:00 | 13:00 | 28.9 | 32.6 | 0 | 2.1 | NNW | 70 | 1015 |
| 10:00 | 14:00 | 30.6 | 34.5 | 0 | 1.9 | NNW | 65 | 1015 |
| 11:00 | 15:00 | 32.4 | 36 | 0.03 | 0.9 | N | 52 | 1014 |
| 12:00 | 16:00 | 32.8 | 37.1 | 0.02 | 0.5 | WNW | 52 | 1014 |
| 13:00 | 17:00 | 33.1 | 37 | 0.01 | 1 | W | 52 | 1014 |
| 14:00 | 18:00 | 33.4 | 37.1 | 0.01 | 1.5 | WSW | 51 | 1014 |
| 15:00 | 19:00 | 34.3 | 37.9 | 0.03 | 1.7 | WSW | 50 | 1013 |
| 16:00 | 20:00 | 34.1 | 37.2 | 0 | 1.9 | W | 48 | 1012 |
| 17:00 | 21:00 | 34 | 36.7 | 0 | 1.8 | W | 46 | 1012 |
| 18:00 | 22:00 | 33.3 | 37.8 | 0 | 0.9 | WSW | 54 | 1011 |
| 19:00 | 23:00 | 33.3 | 37.2 | 0 | 0.6 | SSW | 50 | 1011 |
| 20:00 | 00:00 | 31.8 | 35.8 | 0 | 0.6 | S | 54 | 1012 |
| 21:00 | 01:00 | 31.1 | 34.4 | 0 | 0.8 | SE | 52 | 1012 |
| 22:00 | 02:00 | 30.8 | 34.7 | 0 | 1.1 | ESE | 59 | 1012 |
| 23:00 | 03:00 | 29.1 | 34.1 | 0 | 1.1 | SE | 74 | 1012 |
Nearby cities
Need this verified for an official or legal purpose? Request a weather verification report.
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
- Washington — 39.000°, -77.000°, ERA5 grid cell center, 12.1 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 21 July 2017 specifically — not a monthly average. See the Washington 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 Washington, 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 Washington, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Washington, 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 Washington, 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.