Home / Aurora / 23 September 2017
Aurora
United States · 23 September 2017
← 22 September 201724 September 2017 →
Average
10.5°C
low 7°C · high 14.7°C
Rainfall
12.7mm
rain recorded
Wind
3.3m/s
daily average
Humidity
76%
daily average
Cloud
73%
cover
Pressure
1013hPa
daily average
The temperature ranged from 7°C around 22:00 to 14.7°C around 00:00. Rain was recorded across 10 hours, from around 11:00 to 23:00 (12.7mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
1th percentile
Low temperature
8th percentile
Rainfall
99th percentile
Wind
81th 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 18.7°C, versus 10.5°C on this specific day.
Sun & daylight
Sunrise
06:47
Sunset
18:53
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 | 14.7°C | 11.1°C | 0 | 4.2 | N | 59 | 1010 |
| 01:00 | 07:00 | 14.3°C | 10.4°C | 0.01 | 4.3 | NNE | 58 | 1011 |
| 02:00 | 08:00 | 13°C | 9.3°C | 0 | 3.9 | N | 60 | 1011 |
| 03:00 | 09:00 | 12.3°C | 9°C | 0 | 3.2 | N | 62 | 1012 |
| 04:00 | 10:00 | 9.7°C | 7.8°C | 0 | 1 | WNW | 71 | 1013 |
| 05:00 | 11:00 | 9.6°C | 6.8°C | 0 | 2.3 | NE | 72 | 1012 |
| 06:00 | 12:00 | 9.4°C | 6.2°C | 0 | 3 | NE | 74 | 1013 |
| 07:00 | 13:00 | 9.1°C | 6.2°C | 0 | 2.7 | NNE | 78 | 1014 |
| 08:00 | 14:00 | 9.2°C | 6.1°C | 0 | 3 | NNE | 77 | 1014 |
| 09:00 | 15:00 | 10.4°C | 7.1°C | 0.01 | 3.4 | NNE | 73 | 1013 |
| 10:00 | 16:00 | 11°C | 8.2°C | 0.02 | 2.6 | NE | 69 | 1013 |
| 11:00 | 17:00 | 11.6°C | 8.2°C | 0.25 | 3.6 | ENE | 69 | 1013 |
| 12:00 | 18:00 | 12.4°C | 9°C | 0.47 | 3.9 | ENE | 70 | 1012 |
| 13:00 | 19:00 | 12.9°C | 10°C | 0.09 | 3.5 | ENE | 73 | 1011 |
| 14:00 | 20:00 | 13.7°C | 10.5°C | 0.19 | 4 | ENE | 71 | 1010 |
| 15:00 | 21:00 | 13.3°C | 9.8°C | 0.05 | 4.3 | ENE | 69 | 1008 |
| 16:00 | 22:00 | 11.1°C | 7.1°C | 0.06 | 4.6 | NNW | 76 | 1011 |
| 17:00 | 23:00 | 9.7°C | 3.7°C | 0.82 | 7.3 | N | 80 | 1012 |
| 18:00 | 00:00 | 8.5°C | 4.3°C | 0.76 | 4.8 | NNE | 88 | 1013 |
| 19:00 | 01:00 | 7.7°C | 4.6°C | 2.35 | 3.4 | N | 94 | 1015 |
| 20:00 | 02:00 | 7.7°C | 5.4°C | 3.3 | 2.3 | NNW | 95 | 1015 |
| 21:00 | 03:00 | 7.3°C | 5°C | 2.55 | 2.2 | NNE | 96 | 1015 |
| 22:00 | 04:00 | 7°C | 5.9°C | 1.38 | 0.3 | WSW | 96 | 1015 |
| 23:00 | 05:00 | 7°C | 5.5°C | 0.36 | 0.8 | W | 94 | 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
- Aurora — 39.750°, -104.750°, ERA5 grid cell center, 7.4 km from requested point
- Time zone
- America/Denver
- What's shown here
- The hourly and daily record for 23 September 2017 specifically — not a monthly average. See the Aurora 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 (2026-07-20). Historical climate data for Aurora, United States (39.75°N, 104.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Aurora, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Aurora, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 20, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Aurora, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-20},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.