Union
United States · 29 August 2018
← 28 August 201830 August 2018 →
Average
24°C
low 22.3° · high 26.9°
Rainfall
0.7mm
dry day
Wind
2.8m/s
daily average
Humidity
80.8%
daily average
Cloud
96%
cover
Pressure
1017hPa
daily average
The temperature ranged from 22.3°C around 07:00 to 26.9°C around 00:00. Rain was recorded across 3 hours, from around 11:00 to 23:00 (0.7mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
30th percentile
Low temperature
86th percentile
Rainfall
67th 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 23.4°C, versus 24°C on this specific day.
Sun & daylight
Sunrise
06:30
Sunset
19:38
Day length
13h 8m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Chicago.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | 26.9 | 28.5 | 0 | 4.8 | SSW | 77 | 1013 |
| 01:00 | 06:00 | 26.5 | 28.4 | 0 | 4.3 | SSW | 78 | 1014 |
| 02:00 | 07:00 | 26.1 | 27.8 | 0 | 3.9 | SSW | 77 | 1014 |
| 03:00 | 08:00 | 24.7 | 25.8 | 0 | 4.4 | SSW | 79 | 1013 |
| 04:00 | 09:00 | 24.4 | 25.4 | 0 | 4.3 | SSW | 80 | 1014 |
| 05:00 | 10:00 | 22.8 | 25.7 | 0 | 1.2 | NNW | 85 | 1016 |
| 06:00 | 11:00 | 22.4 | 25.1 | 0 | 1.2 | E | 86 | 1017 |
| 07:00 | 12:00 | 22.3 | 24 | 0 | 2.9 | ESE | 86 | 1017 |
| 08:00 | 13:00 | 22.6 | 24 | 0 | 3.4 | SSE | 86 | 1017 |
| 09:00 | 14:00 | 23.2 | 24.8 | 0 | 3.2 | S | 84 | 1018 |
| 10:00 | 15:00 | 24.3 | 25.7 | 0.03 | 3.3 | SSE | 77 | 1018 |
| 11:00 | 16:00 | 23.7 | 25.2 | 0.14 | 3.1 | S | 80 | 1017 |
| 12:00 | 17:00 | 23.4 | 25.1 | 0.06 | 2.9 | SW | 82 | 1018 |
| 13:00 | 18:00 | 23.1 | 25 | 0.11 | 2.8 | WSW | 84 | 1017 |
| 14:00 | 19:00 | 23.5 | 25.2 | 0 | 3.3 | WSW | 84 | 1017 |
| 15:00 | 20:00 | 23.6 | 25.8 | 0 | 2.7 | W | 85 | 1017 |
| 16:00 | 21:00 | 24.1 | 26.3 | 0 | 2 | NW | 78 | 1017 |
| 17:00 | 22:00 | 25.7 | 28.5 | 0.05 | 2.2 | NW | 76 | 1017 |
| 18:00 | 23:00 | 25.2 | 28.3 | 0.07 | 1.4 | NNW | 77 | 1017 |
| 19:00 | 00:00 | 24.5 | 27.4 | 0.02 | 1.4 | NNE | 77 | 1018 |
| 20:00 | 01:00 | 23.7 | 25.7 | 0 | 2 | NE | 77 | 1018 |
| 21:00 | 02:00 | 23.4 | 25.3 | 0.01 | 2.1 | ENE | 78 | 1019 |
| 22:00 | 03:00 | 22.5 | 24.8 | 0.06 | 1.8 | ENE | 84 | 1020 |
| 23:00 | 04:00 | 22.6 | 25 | 0.17 | 1.7 | ENE | 84 | 1020 |
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 29 August 2018 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 (2026-07-17). 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 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Union, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 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 2026-07-17},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.