Home / Keystone / 28 September 2017
Keystone
United States · 28 September 2017
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Average
27.9°C
low 21.8° · high 32.9°
Rainfall
0.7mm
dry day
Wind
1.5m/s
daily average
Humidity
73.4%
daily average
Cloud
39%
cover
Pressure
1012hPa
daily average
The temperature ranged from 21.8°C around 06:00 to 32.9°C around 16:00. Rain was recorded across 3 hours, from around 12:00 to 14:00 (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
90th percentile
Low temperature
27th percentile
Rainfall
50th percentile
Wind
7th 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 26.3°C, versus 27.9°C on this specific day.
Sun & daylight
Sunrise
07:21
Sunset
19:19
Day length
11h 58m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/New_York.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 04:00 | 27.9 | 32.5 | 0 | 1.3 | E | 77 | 1013 |
| 01:00 | 05:00 | 27 | 31.5 | 0 | 1.5 | ESE | 81 | 1013 |
| 02:00 | 06:00 | 24.9 | 29 | 0 | 1.4 | ESE | 88 | 1013 |
| 03:00 | 07:00 | 24.7 | 28.9 | 0 | 1.2 | E | 89 | 1012 |
| 04:00 | 08:00 | 24.7 | 28.9 | 0 | 1.4 | ENE | 89 | 1012 |
| 05:00 | 09:00 | 24.9 | 29 | 0 | 1.3 | ENE | 88 | 1012 |
| 06:00 | 10:00 | 21.8 | 24.6 | 0 | 1.6 | E | 91 | 1012 |
| 07:00 | 11:00 | 22.1 | 24.9 | 0 | 1.5 | E | 90 | 1012 |
| 08:00 | 12:00 | 22.9 | 25.5 | 0 | 2 | ESE | 87 | 1013 |
| 09:00 | 13:00 | 25.5 | 29.3 | 0 | 1.7 | ESE | 84 | 1013 |
| 10:00 | 14:00 | 27.7 | 32 | 0 | 1.5 | ESE | 76 | 1013 |
| 11:00 | 15:00 | 30.7 | 34.3 | 0 | 1.5 | ESE | 60 | 1014 |
| 12:00 | 16:00 | 31.5 | 35.1 | 0.31 | 1.9 | ESE | 58 | 1013 |
| 13:00 | 17:00 | 31.4 | 35.2 | 0.24 | 1.6 | ESE | 59 | 1013 |
| 14:00 | 18:00 | 31.7 | 36 | 0.19 | 0.9 | E | 58 | 1012 |
| 15:00 | 19:00 | 32.3 | 37.2 | 0 | 0.5 | NE | 58 | 1012 |
| 16:00 | 20:00 | 32.9 | 37.9 | 0 | 0.7 | NE | 58 | 1011 |
| 17:00 | 21:00 | 32.9 | 37.7 | 0 | 1 | NNE | 58 | 1011 |
| 18:00 | 22:00 | 32.5 | 35.7 | 0 | 1.9 | WNW | 53 | 1011 |
| 19:00 | 23:00 | 30.5 | 35.6 | 0 | 1.1 | WNW | 69 | 1011 |
| 20:00 | 00:00 | 28.3 | 32 | 0 | 1.5 | NNW | 69 | 1012 |
| 21:00 | 01:00 | 27.4 | 30.7 | 0 | 1.8 | NNE | 71 | 1013 |
| 22:00 | 02:00 | 27.2 | 30.1 | 0 | 2 | ENE | 71 | 1013 |
| 23:00 | 03:00 | 26.2 | 29.3 | 0 | 2.2 | ENE | 77 | 1013 |
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
- Keystone — 28.250°, -82.500°, ERA5 grid cell center, 15.8 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 28 September 2017 specifically — not a monthly average. See the Keystone 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 Keystone, United States (28.25°N, 82.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Keystone, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Keystone, 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 Keystone, 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.