Home / Walnut / 31 January 2019
Walnut
United States · 31 January 2019
← 30 January 20191 February 2019 →
Average
10.9°C
low 7.7°C · high 13.4°C
Rainfall
14.2mm
rain recorded
Wind
1.2m/s
daily average
Humidity
88.9%
daily average
Cloud
62%
cover
Pressure
1014hPa
daily average
The temperature ranged from 7.7°C around 23:00 to 13.4°C around 12:00. Rain was recorded across 8 hours, from around 10:00 to 17:00 (14.2mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
16th percentile
Low temperature
61th percentile
Rainfall
95th percentile
Wind
22th 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 12.1°C, versus 10.9°C on this specific day.
Sun & daylight
Sunrise
06:48
Sunset
17:20
Day length
10h 32m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Los_Angeles.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 08:00 | 10.9°C | 10.3°C | 0 | 0.6 | SE | 88 | 1014 |
| 01:00 | 09:00 | 10.5°C | 10.2°C | 0 | 0.3 | ENE | 96 | 1014 |
| 02:00 | 10:00 | 11°C | 10.6°C | 0 | 0.5 | E | 89 | 1014 |
| 03:00 | 11:00 | 10.3°C | 9.8°C | 0 | 0.5 | ESE | 92 | 1014 |
| 04:00 | 12:00 | 10.4°C | 9.8°C | 0 | 0.6 | ESE | 92 | 1014 |
| 05:00 | 13:00 | 10.9°C | 10.1°C | 0 | 0.9 | E | 91 | 1014 |
| 06:00 | 14:00 | 10.9°C | 10.3°C | 0 | 0.5 | SSE | 90 | 1014 |
| 07:00 | 15:00 | 11.2°C | 10.6°C | 0.01 | 0.6 | ENE | 88 | 1014 |
| 08:00 | 16:00 | 11.6°C | 10.4°C | 0.01 | 1.6 | E | 87 | 1015 |
| 09:00 | 17:00 | 12.6°C | 10.8°C | 0.01 | 2.6 | ESE | 83 | 1015 |
| 10:00 | 18:00 | 13.1°C | 11.2°C | 0.24 | 2.4 | SSE | 77 | 1015 |
| 11:00 | 19:00 | 13°C | 11.8°C | 0.86 | 1.6 | SSE | 80 | 1015 |
| 12:00 | 20:00 | 13.4°C | 12.7°C | 1.46 | 1.2 | SE | 83 | 1015 |
| 13:00 | 21:00 | 13.1°C | 12.7°C | 2.59 | 0.9 | E | 87 | 1014 |
| 14:00 | 22:00 | 11.5°C | 11.1°C | 4.06 | 0.8 | NE | 93 | 1014 |
| 15:00 | 23:00 | 11.7°C | 10.4°C | 3.31 | 2.2 | ENE | 93 | 1014 |
| 16:00 | 00:00 | 11.6°C | 9.7°C | 1.36 | 2.9 | ENE | 94 | 1013 |
| 17:00 | 01:00 | 11.7°C | 10.7°C | 0.25 | 1.5 | ENE | 90 | 1013 |
| 18:00 | 02:00 | 10.9°C | 9.8°C | 0.06 | 1.3 | NNE | 89 | 1014 |
| 19:00 | 03:00 | 9.5°C | 8.3°C | 0 | 1.1 | NNE | 92 | 1014 |
| 20:00 | 04:00 | 8.5°C | 6.9°C | 0 | 1.2 | NNE | 89 | 1014 |
| 21:00 | 05:00 | 8.1°C | 6.6°C | 0 | 1 | NNE | 91 | 1015 |
| 22:00 | 06:00 | 8.1°C | 6.7°C | 0 | 0.9 | NE | 91 | 1015 |
| 23:00 | 07:00 | 7.7°C | 6.3°C | 0 | 0.8 | NE | 90 | 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
- Walnut — 34.000°, -117.750°, ERA5 grid cell center, 10.9 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 31 January 2019 specifically — not a monthly average. See the Walnut 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 (2026-07-19). Historical climate data for Walnut, United States (34.00°N, 117.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Walnut, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Walnut, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 19, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Walnut, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-19},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.