Home / Arnold / 20 October 2017
Arnold
United States · 20 October 2017
← 19 October 201721 October 2017 →
Average
6.3°C
low 2.8°C · high 10°C
Rainfall
18.3mm
rain recorded
Wind
2.7m/s
daily average
Humidity
74.8%
daily average
Cloud
73%
cover
Pressure
1017hPa
daily average
The temperature ranged from 2.8°C around 23:00 to 10°C around 00:00. Rain was recorded across 7 hours, from around 00:00 to 06:00 (18.3mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
5th percentile
Low temperature
19th percentile
Rainfall
94th percentile
Wind
74th 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 11.9°C, versus 6.3°C on this specific day.
Sun & daylight
Sunrise
07:15
Sunset
18:15
Day length
11h 1m
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 | 07:00 | 10°C | 6.6°C | 1.5 | 4.2 | S | 88 | 1011 |
| 01:00 | 08:00 | 9.1°C | 4.5°C | 1.99 | 5.7 | SSW | 88 | 1011 |
| 02:00 | 09:00 | 7.9°C | 2.3°C | 2.54 | 7.1 | SSW | 94 | 1011 |
| 03:00 | 10:00 | 6.2°C | 0.2°C | 4.94 | 7.1 | WSW | 93 | 1013 |
| 04:00 | 11:00 | 4.6°C | -0.4°C | 4.91 | 5.1 | W | 94 | 1015 |
| 05:00 | 12:00 | 3.5°C | 0.5°C | 1.91 | 2.1 | NW | 95 | 1017 |
| 06:00 | 13:00 | 3.9°C | 1.3°C | 0.39 | 1.6 | ENE | 95 | 1017 |
| 07:00 | 14:00 | 4.1°C | 1.9°C | 0.07 | 1.1 | E | 95 | 1017 |
| 08:00 | 15:00 | 4.5°C | 2.6°C | 0.01 | 0.3 | SSE | 86 | 1018 |
| 09:00 | 16:00 | 4.8°C | 2.6°C | 0 | 0.8 | SSW | 81 | 1019 |
| 10:00 | 17:00 | 6.2°C | 3.6°C | 0 | 0.9 | SW | 67 | 1018 |
| 11:00 | 18:00 | 7.8°C | 4.6°C | 0 | 1.5 | WSW | 55 | 1018 |
| 12:00 | 19:00 | 8.6°C | 4.8°C | 0.04 | 2.5 | WSW | 53 | 1018 |
| 13:00 | 20:00 | 9°C | 5.4°C | 0 | 2.3 | WSW | 53 | 1018 |
| 14:00 | 21:00 | 9.8°C | 5.8°C | 0 | 2.4 | W | 43 | 1017 |
| 15:00 | 22:00 | 9.6°C | 5.8°C | 0 | 2.5 | WNW | 49 | 1017 |
| 16:00 | 23:00 | 8.5°C | 4.7°C | 0 | 2.5 | WNW | 53 | 1017 |
| 17:00 | 00:00 | 7.7°C | 3.5°C | 0 | 3 | WNW | 57 | 1018 |
| 18:00 | 01:00 | 7°C | 3.1°C | 0 | 2.6 | WNW | 62 | 1018 |
| 19:00 | 02:00 | 6°C | 2.6°C | 0 | 2.2 | NW | 67 | 1019 |
| 20:00 | 03:00 | 3.4°C | 0.4°C | 0 | 1.7 | NNW | 83 | 1020 |
| 21:00 | 04:00 | 3.2°C | 0°C | 0 | 1.8 | NNE | 82 | 1020 |
| 22:00 | 05:00 | 3°C | -0.3°C | 0 | 1.8 | NNE | 81 | 1020 |
| 23:00 | 06:00 | 2.8°C | -0.7°C | 0 | 2 | NE | 80 | 1020 |
Nearby cities
Need this verified for an official or legal purpose? Request a weather verification report.
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
- Arnold — 38.250°, -120.250°, ERA5 grid cell center, 8.8 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 20 October 2017 specifically — not a monthly average. See the Arnold 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 Arnold, United States (38.25°N, 120.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Arnold, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Arnold, 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 Arnold, 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.