Union
United States · 27 August 2017
← 26 August 201728 August 2017 →
Average
22.4°C
low 15.7°C · high 29.5°C
Rainfall
1.5mm
rain recorded
Wind
1.8m/s
daily average
Humidity
68.1%
daily average
Cloud
69%
cover
Pressure
1017hPa
daily average
The temperature ranged from 15.7°C around 07:00 to 29.5°C around 15:00. Rain was recorded across 2 hours, from around 22:00 to 23:00 (1.5mm 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
19th percentile
Rainfall
70th percentile
Wind
29th 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 24°C, versus 22.4°C on this specific day.
Sun & daylight
Sunrise
06:29
Sunset
19:40
Day length
13h 12m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Chicago.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | 18.8°C | 18°C | 0 | 3 | SE | 74 | 1020 |
| 01:00 | 06:00 | 18.7°C | 17.7°C | 0 | 3.2 | SE | 73 | 1020 |
| 02:00 | 07:00 | 18.7°C | 17.8°C | 0 | 2.9 | SE | 73 | 1019 |
| 03:00 | 08:00 | 17.9°C | 17.1°C | 0 | 2.7 | SE | 76 | 1019 |
| 04:00 | 09:00 | 18.4°C | 17.6°C | 0 | 2.8 | SSE | 74 | 1019 |
| 05:00 | 10:00 | 15.8°C | 14.9°C | 0 | 2.5 | SSE | 81 | 1018 |
| 06:00 | 11:00 | 15.9°C | 14.8°C | 0 | 2.7 | SSE | 81 | 1018 |
| 07:00 | 12:00 | 15.7°C | 14.9°C | 0 | 2.3 | S | 82 | 1019 |
| 08:00 | 13:00 | 17.6°C | 18.3°C | 0 | 1.2 | S | 83 | 1019 |
| 09:00 | 14:00 | 20.7°C | 21.5°C | 0 | 1.3 | S | 71 | 1019 |
| 10:00 | 15:00 | 23.7°C | 24.2°C | 0 | 1.2 | S | 55 | 1019 |
| 11:00 | 16:00 | 25.8°C | 26.9°C | 0 | 0.8 | SSW | 52 | 1019 |
| 12:00 | 17:00 | 27.6°C | 29.1°C | 0 | 0.6 | SSW | 49 | 1018 |
| 13:00 | 18:00 | 28.7°C | 30.2°C | 0 | 0.8 | S | 47 | 1017 |
| 14:00 | 19:00 | 29.3°C | 30.8°C | 0 | 1.2 | S | 47 | 1017 |
| 15:00 | 20:00 | 29.5°C | 31.4°C | 0 | 0.8 | SSW | 48 | 1016 |
| 16:00 | 21:00 | 28.8°C | 30.8°C | 0 | 0.5 | WSW | 49 | 1015 |
| 17:00 | 22:00 | 26.8°C | 30.7°C | 0 | 1 | NNE | 74 | 1015 |
| 18:00 | 23:00 | 26°C | 29.2°C | 0 | 1.4 | NE | 74 | 1015 |
| 19:00 | 00:00 | 24.8°C | 26.4°C | 0 | 2.5 | NE | 71 | 1015 |
| 20:00 | 01:00 | 24.1°C | 25.3°C | 0 | 2.1 | NNE | 68 | 1015 |
| 21:00 | 02:00 | 22.8°C | 23.3°C | 0 | 2.4 | NNE | 69 | 1016 |
| 22:00 | 03:00 | 21.5°C | 22.4°C | 0.11 | 2.4 | NNE | 78 | 1016 |
| 23:00 | 04:00 | 20.7°C | 21.9°C | 1.4 | 2.1 | NE | 83 | 1016 |
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
- Union — 38.500°, -91.000°, ERA5 grid cell center, 5.6 km from requested point
- Time zone
- America/Chicago
- What's shown here
- The hourly and daily record for 27 August 2017 specifically — not a monthly average. See the Union 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 Union, United States (38.50°N, 91.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Union, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Union, 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 Union, 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.