Home / Walla Walla / 20 May 2017
Walla Walla
United States · 20 May 2017
Average
14.9°C
low 10° · high 20.1°
Rainfall
0.2mm
dry day
Wind
2.3m/s
daily average
Humidity
61.8%
daily average
Cloud
42%
cover
Pressure
1017hPa
daily average
The temperature ranged from 10°C around 23:00 to 20.1°C around 15:00. Rain was recorded for one hour, around 12:00 (0.2mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
59th percentile
Low temperature
76th percentile
Rainfall
49th percentile
Wind
48th 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 14.1°C, versus 14.9°C on this specific day.
Sun & daylight
Sunrise
05:15
Sunset
20:24
Day length
15h 10m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Los_Angeles.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 07:00 | 12.3 | 10.3 | 0 | 1.5 | SE | 67 | 1016 |
| 01:00 | 08:00 | 12 | 9.9 | 0 | 1.6 | SE | 66 | 1015 |
| 02:00 | 09:00 | 11.2 | 9.1 | 0 | 1.8 | SE | 71 | 1016 |
| 03:00 | 10:00 | 10.9 | 8.7 | 0 | 1.8 | SSE | 69 | 1016 |
| 04:00 | 11:00 | 11.3 | 8.9 | 0 | 2 | SSE | 68 | 1016 |
| 05:00 | 12:00 | 11.7 | 9.1 | 0 | 2.2 | SSE | 66 | 1016 |
| 06:00 | 13:00 | 11.9 | 9.3 | 0 | 2.2 | SSE | 65 | 1017 |
| 07:00 | 14:00 | 12.3 | 9.7 | 0 | 2.6 | S | 68 | 1017 |
| 08:00 | 15:00 | 15.1 | 12.1 | 0 | 3.2 | SW | 55 | 1018 |
| 09:00 | 16:00 | 15.5 | 12.8 | 0 | 3 | SW | 59 | 1018 |
| 10:00 | 17:00 | 15.7 | 13.3 | 0 | 2.7 | WSW | 60 | 1018 |
| 11:00 | 18:00 | 16.5 | 14.2 | 0.05 | 2.8 | W | 58 | 1018 |
| 12:00 | 19:00 | 16.9 | 14.8 | 0.1 | 2.6 | W | 57 | 1018 |
| 13:00 | 20:00 | 16.9 | 14.8 | 0.04 | 2.6 | WNW | 58 | 1018 |
| 14:00 | 21:00 | 18.5 | 15.9 | 0.01 | 3.1 | WNW | 52 | 1018 |
| 15:00 | 22:00 | 20.1 | 17.4 | 0.01 | 3.5 | NW | 48 | 1017 |
| 16:00 | 23:00 | 19.8 | 17.3 | 0 | 3.2 | N | 48 | 1018 |
| 17:00 | 00:00 | 19.9 | 17.7 | 0 | 2.5 | N | 47 | 1018 |
| 18:00 | 01:00 | 19.8 | 17.5 | 0 | 2.5 | N | 46 | 1017 |
| 19:00 | 02:00 | 18.9 | 16.7 | 0 | 2.3 | N | 48 | 1018 |
| 20:00 | 03:00 | 15.4 | 13.9 | 0 | 1.7 | NNE | 64 | 1018 |
| 21:00 | 04:00 | 12.8 | 10.8 | 0 | 2 | ENE | 71 | 1019 |
| 22:00 | 05:00 | 11.8 | 10.6 | 0 | 1.4 | E | 83 | 1019 |
| 23:00 | 06:00 | 10 | 8.8 | 0 | 1.3 | ESE | 90 | 1020 |
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
- Walla Walla — 46.000°, -118.250°, ERA5 grid cell center, 10.2 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 20 May 2017 specifically — not a monthly average. See the Walla Walla 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 Walla Walla, United States (46.00°N, 118.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Walla Walla, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Walla Walla, 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 Walla Walla, 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.