Union
United States · 28 August 2017
← 27 August 201729 August 2017 →
Average
21.6°C
low 18.2°C · high 27.3°C
Rainfall
8.1mm
rain recorded
Wind
1.3m/s
daily average
Humidity
84.6%
daily average
Cloud
43%
cover
Pressure
1015hPa
daily average
The temperature ranged from 18.2°C around 03:00 to 27.3°C around 14:00. Rain was recorded across 14 hours, from around 00:00 to 19:00 (8.1mm total).
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
41th percentile
Rainfall
87th percentile
Wind
4th 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 23.9°C, versus 21.6°C on this specific day.
Sun & daylight
Sunrise
06:30
Sunset
19:39
Day length
13h 9m
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 | 20°C | 21.7°C | 1.74 | 1.7 | NNE | 90 | 1016 |
| 01:00 | 06:00 | 19.5°C | 21.3°C | 0.67 | 1.7 | N | 93 | 1016 |
| 02:00 | 07:00 | 19°C | 20.8°C | 1.28 | 1.7 | N | 95 | 1016 |
| 03:00 | 08:00 | 18.2°C | 20°C | 1.33 | 1.4 | N | 98 | 1015 |
| 04:00 | 09:00 | 18.6°C | 20.6°C | 0.8 | 1.4 | N | 98 | 1015 |
| 05:00 | 10:00 | 18.3°C | 20.5°C | 0.41 | 1 | NNW | 100 | 1015 |
| 06:00 | 11:00 | 18.5°C | 20.3°C | 0.25 | 1.9 | N | 100 | 1015 |
| 07:00 | 12:00 | 18.7°C | 20.5°C | 0.1 | 1.8 | N | 99 | 1016 |
| 08:00 | 13:00 | 19.3°C | 21.9°C | 0.05 | 1.2 | N | 100 | 1016 |
| 09:00 | 14:00 | 20.5°C | 22.9°C | 0.02 | 1.7 | N | 95 | 1016 |
| 10:00 | 15:00 | 22.6°C | 24°C | 0 | 1.9 | N | 75 | 1016 |
| 11:00 | 16:00 | 24.1°C | 25.7°C | 0.02 | 1.9 | NNE | 70 | 1016 |
| 12:00 | 17:00 | 25.5°C | 27.2°C | 0.01 | 1.6 | NNE | 63 | 1016 |
| 13:00 | 18:00 | 26.9°C | 29.2°C | 0.01 | 1.2 | NE | 61 | 1015 |
| 14:00 | 19:00 | 27.3°C | 29.8°C | 0.27 | 1.2 | NE | 62 | 1015 |
| 15:00 | 20:00 | 26.4°C | 28.9°C | 0.12 | 0.9 | NE | 63 | 1014 |
| 16:00 | 21:00 | 26°C | 28.4°C | 0.11 | 0.8 | ENE | 62 | 1014 |
| 17:00 | 22:00 | 23.8°C | 26.1°C | 0.29 | 1.7 | SE | 77 | 1014 |
| 18:00 | 23:00 | 23.2°C | 26.4°C | 0.49 | 0.4 | ESE | 80 | 1014 |
| 19:00 | 00:00 | 22.5°C | 26°C | 0.1 | 0.3 | NNW | 85 | 1014 |
| 20:00 | 01:00 | 21.1°C | 23.7°C | 0.03 | 0.4 | NNE | 84 | 1015 |
| 21:00 | 02:00 | 20.5°C | 23.1°C | 0 | 0.7 | NNE | 88 | 1015 |
| 22:00 | 03:00 | 19°C | 21.1°C | 0 | 1.2 | NE | 96 | 1015 |
| 23:00 | 04:00 | 19.4°C | 21.4°C | 0.01 | 1.5 | NNE | 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
- 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 28 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 (2026-07-19). 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 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Union, 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 Union, 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.