Home / Walla Walla / 20 May 2020
Walla Walla
United States · 20 May 2020
Average
9.2°C
low 7.9° · high 11°
Rainfall
47.1mm
rain recorded
Wind
4.1m/s
daily average
Humidity
90.7%
daily average
Cloud
99%
cover
Pressure
1011hPa
daily average
The temperature ranged from 7.9°C around 13:00 to 11°C around 19:00. Rain was recorded across 22 hours, from around 00:00 to 21:00 (47.1mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
2th percentile
Low temperature
47th percentile
Rainfall
100th percentile
Wind
84th 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 9.2°C on this specific day.
Sun & daylight
Sunrise
05:14
Sunset
20:25
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 | 10.5 | 8.5 | 0.88 | 2.5 | SSW | 89 | 1012 |
| 01:00 | 08:00 | 10.2 | 8 | 1.45 | 2.7 | SSW | 90 | 1011 |
| 02:00 | 09:00 | 9.3 | 6.8 | 1.84 | 3 | SSW | 93 | 1011 |
| 03:00 | 10:00 | 8.8 | 6.6 | 2.23 | 2.5 | SW | 97 | 1009 |
| 04:00 | 11:00 | 8.8 | 6.2 | 2.18 | 3.1 | SW | 97 | 1009 |
| 05:00 | 12:00 | 8.8 | 6.3 | 2.21 | 3.1 | SW | 96 | 1009 |
| 06:00 | 13:00 | 8.7 | 6.1 | 2.33 | 3.1 | SW | 96 | 1009 |
| 07:00 | 14:00 | 8.6 | 5.7 | 2.7 | 3.5 | SW | 95 | 1009 |
| 08:00 | 15:00 | 9 | 6 | 3.05 | 3.7 | SW | 93 | 1010 |
| 09:00 | 16:00 | 9 | 5.9 | 2.88 | 3.8 | SW | 94 | 1010 |
| 10:00 | 17:00 | 8.5 | 5.2 | 2.61 | 4 | SW | 96 | 1010 |
| 11:00 | 18:00 | 8.2 | 4.8 | 2.3 | 4.1 | SW | 96 | 1011 |
| 12:00 | 19:00 | 8.2 | 4.6 | 3.58 | 4.4 | SSW | 97 | 1011 |
| 13:00 | 20:00 | 7.9 | 4.2 | 3.69 | 4.4 | SSW | 97 | 1011 |
| 14:00 | 21:00 | 8 | 4.2 | 3.29 | 4.4 | SSW | 95 | 1012 |
| 15:00 | 22:00 | 9.5 | 6.3 | 2.42 | 4.1 | S | 95 | 1012 |
| 16:00 | 23:00 | 9.4 | 6.5 | 2.28 | 3.7 | S | 93 | 1011 |
| 17:00 | 00:00 | 10 | 7.4 | 2.06 | 3.2 | S | 91 | 1011 |
| 18:00 | 01:00 | 10.9 | 8.2 | 1.44 | 3.3 | S | 85 | 1011 |
| 19:00 | 02:00 | 11 | 7 | 0.82 | 4.8 | SW | 79 | 1011 |
| 20:00 | 03:00 | 10.3 | 4.9 | 0.56 | 6.5 | WSW | 77 | 1012 |
| 21:00 | 04:00 | 9.7 | 4 | 0.23 | 6.9 | WSW | 77 | 1013 |
| 22:00 | 05:00 | 9.2 | 3.5 | 0.06 | 6.7 | SW | 80 | 1014 |
| 23:00 | 06:00 | 9.2 | 3.7 | 0.05 | 6.5 | SW | 81 | 1014 |
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 2020 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.