Home / Walla Walla / 21 May 2018
Walla Walla
United States · 21 May 2018
Average
17.5°C
low 12.5° · high 23.8°
Rainfall
0.3mm
dry day
Wind
1.9m/s
daily average
Humidity
59.3%
daily average
Cloud
45%
cover
Pressure
1012hPa
daily average
The temperature ranged from 12.5°C around 07:00 to 23.8°C around 16:00. Rain was recorded for one hour, around 05:00 (0.3mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
81th percentile
Low temperature
95th percentile
Rainfall
56th percentile
Wind
30th 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 13.7°C, versus 17.5°C on this specific day.
Sun & daylight
Sunrise
05:14
Sunset
20:25
Day length
15h 11m
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 | 15 | 13.7 | 0 | 2.2 | SSW | 75 | 1012 |
| 01:00 | 08:00 | 15.2 | 13.7 | 0 | 2.3 | SSW | 71 | 1012 |
| 02:00 | 09:00 | 15.5 | 14.1 | 0.04 | 1.9 | S | 68 | 1012 |
| 03:00 | 10:00 | 12.8 | 10.9 | 0 | 1.6 | S | 68 | 1013 |
| 04:00 | 11:00 | 13 | 11.2 | 0.01 | 1.5 | S | 67 | 1013 |
| 05:00 | 12:00 | 13.2 | 11.5 | 0.12 | 1.5 | S | 67 | 1013 |
| 06:00 | 13:00 | 12.9 | 11.2 | 0.02 | 1.5 | S | 68 | 1013 |
| 07:00 | 14:00 | 12.5 | 10.6 | 0.05 | 1.9 | SSW | 73 | 1014 |
| 08:00 | 15:00 | 14.3 | 12.6 | 0.04 | 1.7 | SSW | 66 | 1014 |
| 09:00 | 16:00 | 14.9 | 13 | 0 | 2 | SSW | 63 | 1015 |
| 10:00 | 17:00 | 17.2 | 15.5 | 0 | 1.7 | SW | 55 | 1014 |
| 11:00 | 18:00 | 18.6 | 17.1 | 0 | 1.6 | WSW | 52 | 1014 |
| 12:00 | 19:00 | 19.3 | 17.7 | 0.06 | 2 | WNW | 51 | 1014 |
| 13:00 | 20:00 | 20.1 | 18 | 0 | 2.5 | WNW | 48 | 1013 |
| 14:00 | 21:00 | 22.5 | 20.5 | 0 | 2.5 | NW | 42 | 1012 |
| 15:00 | 22:00 | 23.1 | 21.2 | 0 | 2.4 | NNW | 40 | 1012 |
| 16:00 | 23:00 | 23.8 | 21.7 | 0 | 2.6 | N | 39 | 1011 |
| 17:00 | 00:00 | 23.3 | 21.2 | 0 | 2.8 | N | 40 | 1011 |
| 18:00 | 01:00 | 23.4 | 21.5 | 0 | 2.5 | NNE | 40 | 1011 |
| 19:00 | 02:00 | 23.4 | 22 | 0 | 1.7 | NNE | 39 | 1011 |
| 20:00 | 03:00 | 18.4 | 17.9 | 0 | 1.2 | NE | 63 | 1011 |
| 21:00 | 04:00 | 17.1 | 16.6 | 0 | 1.3 | ESE | 67 | 1011 |
| 22:00 | 05:00 | 15.8 | 15.5 | 0 | 1.3 | ESE | 77 | 1011 |
| 23:00 | 06:00 | 14.5 | 13.9 | 0 | 1.4 | ESE | 80 | 1011 |
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 21 May 2018 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.