Home / Walla Walla / 20 May 2023
Walla Walla
United States · 20 May 2023
Average
23.6°C
low 15.3° · high 31.5°
Rainfall
0.9mm
dry day
Wind
1.5m/s
daily average
Humidity
53.1%
daily average
Cloud
52%
cover
Pressure
1015hPa
daily average
The temperature ranged from 15.3°C around 05:00 to 31.5°C around 16:00. Rain was recorded for one hour, around 18:00 (0.9mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
100th percentile
Low temperature
99th percentile
Rainfall
66th percentile
Wind
5th 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 13.5°C, versus 23.6°C on this specific day.
Sun & daylight
Sunrise
05:15
Sunset
20:24
Day length
15h 9m
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 | 20.2 | 20 | 0 | 2.1 | SSE | 68 | 1016 |
| 01:00 | 08:00 | 20.5 | 20.5 | 0 | 1.9 | SSE | 67 | 1016 |
| 02:00 | 09:00 | 17.9 | 18.1 | 0 | 1.4 | SE | 76 | 1016 |
| 03:00 | 10:00 | 15.8 | 14.5 | 0 | 1.9 | SE | 67 | 1016 |
| 04:00 | 11:00 | 16 | 14.7 | 0 | 2 | ESE | 70 | 1016 |
| 05:00 | 12:00 | 15.3 | 14.2 | 0 | 1.9 | ESE | 75 | 1016 |
| 06:00 | 13:00 | 15.4 | 14.2 | 0 | 2.1 | ESE | 74 | 1016 |
| 07:00 | 14:00 | 16.9 | 16.1 | 0 | 2.1 | SE | 73 | 1017 |
| 08:00 | 15:00 | 23 | 23.3 | 0 | 1.3 | SE | 57 | 1017 |
| 09:00 | 16:00 | 24.2 | 24.6 | 0 | 0.5 | S | 47 | 1017 |
| 10:00 | 17:00 | 25.3 | 25.8 | 0 | 0.3 | WNW | 44 | 1016 |
| 11:00 | 18:00 | 26.3 | 26.9 | 0 | 0.4 | N | 43 | 1016 |
| 12:00 | 19:00 | 26.9 | 27.6 | 0 | 0.4 | NNW | 43 | 1015 |
| 13:00 | 20:00 | 28 | 28.7 | 0 | 0.7 | WNW | 41 | 1015 |
| 14:00 | 21:00 | 29.8 | 30 | 0 | 1.1 | WNW | 36 | 1014 |
| 15:00 | 22:00 | 31.1 | 30.8 | 0 | 1.3 | NNW | 31 | 1014 |
| 16:00 | 23:00 | 31.5 | 30.7 | 0 | 2 | NNE | 30 | 1013 |
| 17:00 | 00:00 | 31.3 | 30.2 | 0.02 | 2.4 | ENE | 31 | 1012 |
| 18:00 | 01:00 | 28.9 | 29.6 | 0.91 | 1.6 | ENE | 45 | 1012 |
| 19:00 | 02:00 | 28.5 | 30 | 0 | 1 | ENE | 48 | 1012 |
| 20:00 | 03:00 | 24.1 | 25.7 | 0 | 0.7 | SE | 61 | 1012 |
| 21:00 | 04:00 | 24.1 | 23.5 | 0 | 2.1 | SSW | 50 | 1013 |
| 22:00 | 05:00 | 24 | 23 | 0 | 2.4 | SW | 47 | 1014 |
| 23:00 | 06:00 | 22.6 | 21.3 | 0 | 2.7 | SSW | 52 | 1015 |
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 2023 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.