Home / Spring / 21 August 2017
Spring
United States · 21 August 2017
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Average
29.1°C
low 24.8°C · high 33.4°C
Rainfall
0.6mm
dry day
Wind
2.4m/s
daily average
Humidity
74.5%
daily average
Cloud
21%
cover
Pressure
1017hPa
daily average
The temperature ranged from 24.8°C around 05:00 to 33.4°C around 16:00. Rain was recorded across 2 hours, from around 16:00 to 18:00 (0.6mm 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
61th percentile
Rainfall
41th percentile
Wind
66th 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 29°C, versus 29.1°C on this specific day.
Sun & daylight
Sunrise
06:53
Sunset
19:56
Day length
13h 4m
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 | 27.5°C | 32.5°C | 0 | 2.2 | SE | 88 | 1017 |
| 01:00 | 06:00 | 26.9°C | 32°C | 0 | 1.7 | SSE | 88 | 1018 |
| 02:00 | 07:00 | 26.4°C | 31.5°C | 0 | 1.5 | SSE | 90 | 1018 |
| 03:00 | 08:00 | 26.1°C | 31.3°C | 0 | 1.3 | SE | 91 | 1017 |
| 04:00 | 09:00 | 25.7°C | 31.1°C | 0 | 1.2 | ESE | 95 | 1017 |
| 05:00 | 10:00 | 24.8°C | 30.3°C | 0 | 0.8 | WNW | 98 | 1017 |
| 06:00 | 11:00 | 24.9°C | 30.7°C | 0 | 0.4 | ENE | 98 | 1017 |
| 07:00 | 12:00 | 24.9°C | 30.6°C | 0 | 0.7 | NE | 99 | 1017 |
| 08:00 | 13:00 | 26°C | 31.8°C | 0.01 | 1.1 | NE | 96 | 1017 |
| 09:00 | 14:00 | 28.3°C | 34.4°C | 0.06 | 1.1 | E | 86 | 1018 |
| 10:00 | 15:00 | 31.1°C | 35°C | 0.02 | 2.1 | SE | 63 | 1018 |
| 11:00 | 16:00 | 32°C | 35.3°C | 0.02 | 2.5 | SE | 58 | 1018 |
| 12:00 | 17:00 | 33°C | 35.4°C | 0.01 | 3 | SE | 51 | 1018 |
| 13:00 | 18:00 | 32.9°C | 34.8°C | 0 | 3.4 | SE | 51 | 1018 |
| 14:00 | 19:00 | 32.5°C | 34.2°C | 0 | 3.6 | SE | 51 | 1018 |
| 15:00 | 20:00 | 33.1°C | 35.2°C | 0 | 3.8 | SE | 53 | 1017 |
| 16:00 | 21:00 | 33.4°C | 35.1°C | 0.2 | 4 | SE | 50 | 1017 |
| 17:00 | 22:00 | 32.8°C | 35.9°C | 0 | 3 | ESE | 57 | 1016 |
| 18:00 | 23:00 | 31.5°C | 34°C | 0.23 | 3.6 | E | 59 | 1016 |
| 19:00 | 00:00 | 31.1°C | 33.5°C | 0 | 3.7 | ESE | 60 | 1016 |
| 20:00 | 01:00 | 30.1°C | 32.3°C | 0 | 3.6 | ESE | 62 | 1017 |
| 21:00 | 02:00 | 29°C | 31.8°C | 0 | 3.5 | SE | 71 | 1017 |
| 22:00 | 03:00 | 27.7°C | 31.7°C | 0 | 3.3 | SE | 86 | 1018 |
| 23:00 | 04:00 | 27.2°C | 32°C | 0 | 2.5 | SE | 88 | 1019 |
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
- Spring — 30.000°, -95.500°, ERA5 grid cell center, 11.9 km from requested point
- Time zone
- America/Chicago
- What's shown here
- The hourly and daily record for 21 August 2017 specifically — not a monthly average. See the Spring 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 Spring, United States (30.00°N, 95.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Spring, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Spring, 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 Spring, 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.