Home / Roy / 23 September 2021
Roy
United States · 23 September 2021
← 22 September 202124 September 2021 →
Average
16.3°C
low 8.8°C · high 23.5°C
Rainfall
0.3mm
dry day
Wind
2m/s
daily average
Humidity
38.7%
daily average
Cloud
36%
cover
Pressure
1016hPa
daily average
The temperature ranged from 8.8°C around 06:00 to 23.5°C around 16:00. Rain was recorded across 2 hours, from around 13:00 to 14:00 (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
55th percentile
Low temperature
40th percentile
Rainfall
75th percentile
Wind
69th 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 15.8°C, versus 16.3°C on this specific day.
Sun & daylight
Sunrise
07:16
Sunset
19:22
Day length
12h 6m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Denver.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 06:00 | 12.3°C | 8.9°C | 0 | 1.5 | ENE | 36 | 1015 |
| 01:00 | 07:00 | 12.5°C | 9.5°C | 0 | 1.5 | ENE | 43 | 1015 |
| 02:00 | 08:00 | 11.6°C | 8.5°C | 0 | 1.6 | ENE | 45 | 1015 |
| 03:00 | 09:00 | 11.2°C | 8.3°C | 0 | 1.7 | ENE | 51 | 1015 |
| 04:00 | 10:00 | 9.3°C | 6.6°C | 0 | 1.4 | ENE | 59 | 1015 |
| 05:00 | 11:00 | 8.9°C | 6.2°C | 0 | 1.4 | ENE | 61 | 1016 |
| 06:00 | 12:00 | 8.8°C | 5.9°C | 0 | 1.6 | ENE | 61 | 1016 |
| 07:00 | 13:00 | 8.9°C | 6°C | 0 | 1.6 | ENE | 58 | 1017 |
| 08:00 | 14:00 | 10°C | 6.7°C | 0 | 2.2 | ENE | 54 | 1017 |
| 09:00 | 15:00 | 13.6°C | 9.8°C | 0 | 2.2 | E | 35 | 1018 |
| 10:00 | 16:00 | 17.4°C | 14.5°C | 0.01 | 1.2 | E | 29 | 1018 |
| 11:00 | 17:00 | 20.7°C | 18.1°C | 0 | 0.8 | NNW | 25 | 1018 |
| 12:00 | 18:00 | 21.2°C | 18.4°C | 0 | 1.3 | NW | 25 | 1017 |
| 13:00 | 19:00 | 21.8°C | 18.6°C | 0.12 | 2 | WNW | 25 | 1017 |
| 14:00 | 20:00 | 22.5°C | 19.2°C | 0.19 | 2.1 | WNW | 25 | 1017 |
| 15:00 | 21:00 | 23.1°C | 19.3°C | 0 | 2.9 | WNW | 24 | 1016 |
| 16:00 | 22:00 | 23.5°C | 19.5°C | 0 | 3.3 | WNW | 23 | 1014 |
| 17:00 | 23:00 | 23.3°C | 19.2°C | 0 | 3.4 | NW | 25 | 1015 |
| 18:00 | 00:00 | 22.9°C | 19.3°C | 0 | 2.9 | NW | 26 | 1016 |
| 19:00 | 01:00 | 20.8°C | 17.9°C | 0 | 2.5 | NNW | 35 | 1016 |
| 20:00 | 02:00 | 19.5°C | 16.3°C | 0 | 2.8 | NNW | 36 | 1017 |
| 21:00 | 03:00 | 17.3°C | 14.1°C | 0 | 2.7 | N | 41 | 1017 |
| 22:00 | 04:00 | 16.7°C | 13.6°C | 0 | 2.3 | NNE | 41 | 1017 |
| 23:00 | 05:00 | 13.1°C | 9.9°C | 0 | 2.2 | NNE | 48 | 1018 |
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
- Roy — 41.250°, -112.000°, ERA5 grid cell center, 10.1 km from requested point
- Time zone
- America/Denver
- What's shown here
- The hourly and daily record for 23 September 2021 specifically — not a monthly average. See the Roy 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 (2026-07-21). Historical climate data for Roy, United States (41.25°N, 112.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Roy, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Roy, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 21, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Roy, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-21},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.