Home / Aurora / 18 September 2017
Aurora
United States · 18 September 2017
← 17 September 201719 September 2017 →
Average
19.5°C
low 10.6°C · high 28.2°C
Rainfall
0mm
dry day
Wind
3m/s
daily average
Humidity
40.2%
daily average
Cloud
7%
cover
Pressure
1009hPa
daily average
The temperature ranged from 10.6°C around 06:00 to 28.2°C around 17:00. 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
50th percentile
Low temperature
33th percentile
Rainfall
64th percentile
Wind
78th 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 19.4°C, versus 19.5°C on this specific day.
Sun & daylight
Sunrise
06:43
Sunset
19:02
Day length
12h 19m
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 | 13.9°C | 0 | 1.5 | W | 78 | 1013 |
| 01:00 | 07:00 | 12.8°C | 11.8°C | 0 | 1.7 | W | 85 | 1013 |
| 02:00 | 08:00 | 12.7°C | 11.7°C | 0 | 1.6 | W | 85 | 1014 |
| 03:00 | 09:00 | 12°C | 11°C | 0 | 1.4 | WSW | 85 | 1013 |
| 04:00 | 10:00 | 11°C | 8.7°C | 0 | 2.2 | SW | 74 | 1014 |
| 05:00 | 11:00 | 11°C | 8.9°C | 0 | 1.8 | SW | 73 | 1014 |
| 06:00 | 12:00 | 10.6°C | 8.1°C | 0 | 2.2 | SW | 72 | 1014 |
| 07:00 | 13:00 | 11°C | 8.1°C | 0 | 2.6 | SSW | 69 | 1014 |
| 08:00 | 14:00 | 13.3°C | 9.9°C | 0 | 3.1 | SW | 54 | 1014 |
| 09:00 | 15:00 | 19°C | 15°C | 0 | 2.7 | SW | 26 | 1014 |
| 10:00 | 16:00 | 21.7°C | 17.6°C | 0 | 2.8 | WSW | 21 | 1013 |
| 11:00 | 17:00 | 24.1°C | 20.2°C | 0 | 2.5 | WSW | 19 | 1012 |
| 12:00 | 18:00 | 24.6°C | 20.9°C | 0 | 2.2 | WSW | 18 | 1011 |
| 13:00 | 19:00 | 25°C | 21.7°C | 0 | 1.7 | SW | 18 | 1009 |
| 14:00 | 20:00 | 26.2°C | 22.8°C | 0 | 1.8 | S | 17 | 1008 |
| 15:00 | 21:00 | 27.5°C | 23.9°C | 0 | 1.8 | SSE | 14 | 1006 |
| 16:00 | 22:00 | 27.9°C | 23.7°C | 0 | 2.8 | SE | 14 | 1005 |
| 17:00 | 23:00 | 28.2°C | 23.3°C | 0 | 3.7 | SE | 13 | 1004 |
| 18:00 | 00:00 | 28°C | 22.5°C | 0 | 4.3 | SE | 12 | 1004 |
| 19:00 | 01:00 | 26.1°C | 20.7°C | 0 | 4.2 | SE | 14 | 1003 |
| 20:00 | 02:00 | 23.4°C | 17°C | 0 | 5.9 | SSE | 18 | 1004 |
| 21:00 | 03:00 | 19.7°C | 13.4°C | 0 | 6.2 | S | 27 | 1004 |
| 22:00 | 04:00 | 19.7°C | 13.8°C | 0 | 5.6 | S | 27 | 1004 |
| 23:00 | 05:00 | 18.7°C | 13.1°C | 0 | 5.6 | S | 32 | 1005 |
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
- 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 18 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.