Home / Cotati / 21 October 2017
Cotati
United States · 21 October 2017
← 20 October 201722 October 2017 →
Average
13.1°C
low 7.1°C · high 19.3°C
Rainfall
0mm
dry day
Wind
2.5m/s
daily average
Humidity
72.2%
daily average
Cloud
35%
cover
Pressure
1024hPa
daily average
The temperature ranged from 7.1°C around 06:00 to 19.3°C around 15:00. No measurable rain was recorded during the day.
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
36th percentile
Low temperature
9th percentile
Rainfall
70th 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 15.5°C, versus 13.1°C on this specific day.
Sun & daylight
Sunrise
07:26
Sunset
18:24
Day length
10h 58m
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 | 10.7°C | 8.3°C | 0 | 2.7 | WNW | 82 | 1022 |
| 01:00 | 08:00 | 10.4°C | 7.8°C | 0 | 2.8 | NW | 82 | 1022 |
| 02:00 | 09:00 | 10°C | 7.4°C | 0 | 2.7 | NW | 82 | 1022 |
| 03:00 | 10:00 | 9.1°C | 6.9°C | 0 | 1.9 | NNW | 84 | 1022 |
| 04:00 | 11:00 | 8.2°C | 5.9°C | 0 | 1.9 | NNW | 83 | 1022 |
| 05:00 | 12:00 | 7.6°C | 5.2°C | 0 | 1.8 | NNW | 84 | 1022 |
| 06:00 | 13:00 | 7.1°C | 4.6°C | 0 | 1.8 | NNW | 84 | 1023 |
| 07:00 | 14:00 | 7.3°C | 4.9°C | 0 | 1.8 | NNW | 84 | 1023 |
| 08:00 | 15:00 | 8.1°C | 6.1°C | 0 | 1 | N | 77 | 1024 |
| 09:00 | 16:00 | 10.7°C | 9°C | 0 | 0.8 | NNW | 67 | 1024 |
| 10:00 | 17:00 | 13.2°C | 10.8°C | 0 | 1.6 | NW | 54 | 1025 |
| 11:00 | 18:00 | 15.3°C | 12.8°C | 0 | 2.3 | NW | 55 | 1025 |
| 12:00 | 19:00 | 16.6°C | 14.1°C | 0 | 2.9 | WNW | 57 | 1025 |
| 13:00 | 20:00 | 17.5°C | 15°C | 0 | 3.3 | WNW | 59 | 1024 |
| 14:00 | 21:00 | 18.6°C | 15.7°C | 0 | 3.5 | WNW | 50 | 1024 |
| 15:00 | 22:00 | 19.3°C | 16.8°C | 0 | 3.4 | WNW | 52 | 1023 |
| 16:00 | 23:00 | 19.3°C | 17.1°C | 0 | 3.2 | WNW | 54 | 1023 |
| 17:00 | 00:00 | 18.7°C | 16.4°C | 0 | 3.4 | W | 58 | 1024 |
| 18:00 | 01:00 | 17.6°C | 15°C | 0 | 3.7 | W | 61 | 1024 |
| 19:00 | 02:00 | 16.3°C | 13.8°C | 0 | 3.7 | WNW | 67 | 1025 |
| 20:00 | 03:00 | 14.3°C | 12.6°C | 0 | 3.3 | WNW | 86 | 1025 |
| 21:00 | 04:00 | 13.7°C | 12.1°C | 0 | 3.1 | NW | 89 | 1025 |
| 22:00 | 05:00 | 13.1°C | 11.9°C | 0 | 2.5 | NW | 91 | 1025 |
| 23:00 | 06:00 | 12.6°C | 11.5°C | 0 | 2.2 | NW | 92 | 1025 |
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
- Cotati — 38.250°, -122.750°, ERA5 grid cell center, 9.3 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 21 October 2017 specifically — not a monthly average. See the Cotati 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 Cotati, United States (38.25°N, 122.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Cotati, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Cotati, 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 Cotati, 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.