Home / Keystone / 27 September 2017
Keystone
United States · 27 September 2017
← 26 September 201728 September 2017 →
Average
28.1°C
low 23.3° · high 32.6°
Rainfall
0.3mm
dry day
Wind
1.4m/s
daily average
Humidity
75%
daily average
Cloud
29%
cover
Pressure
1012hPa
daily average
The temperature ranged from 23.3°C around 07:00 to 32.6°C around 17:00. No measurable rain was recorded during the day.
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
84th percentile
Low temperature
63th percentile
Rainfall
35th percentile
Wind
6th 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 26.4°C, versus 28.1°C on this specific day.
Sun & daylight
Sunrise
07:21
Sunset
19:20
Day length
11h 59m
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 | 27.8 | 32.6 | 0 | 1.5 | ESE | 81 | 1013 |
| 01:00 | 05:00 | 25.5 | 30.3 | 0 | 1.1 | ESE | 89 | 1012 |
| 02:00 | 06:00 | 25.1 | 30.3 | 0 | 0.6 | E | 92 | 1012 |
| 03:00 | 07:00 | 25.1 | 30.5 | 0.02 | 0.2 | NE | 92 | 1012 |
| 04:00 | 08:00 | 25.6 | 30.7 | 0 | 1 | N | 91 | 1012 |
| 05:00 | 09:00 | 25.5 | 30.2 | 0 | 1.5 | N | 91 | 1012 |
| 06:00 | 10:00 | 23.5 | 27.2 | 0 | 1.5 | ENE | 92 | 1012 |
| 07:00 | 11:00 | 23.3 | 27 | 0 | 1.5 | NE | 93 | 1012 |
| 08:00 | 12:00 | 23.7 | 27.5 | 0 | 1.4 | NE | 90 | 1012 |
| 09:00 | 13:00 | 25.8 | 30.6 | 0 | 1.3 | ENE | 88 | 1013 |
| 10:00 | 14:00 | 28.1 | 32.9 | 0 | 1.3 | ENE | 78 | 1013 |
| 11:00 | 15:00 | 30.8 | 34.4 | 0 | 1.4 | E | 60 | 1013 |
| 12:00 | 16:00 | 31.8 | 35.6 | 0.02 | 1.1 | ESE | 56 | 1013 |
| 13:00 | 17:00 | 32.2 | 36.4 | 0.04 | 0.5 | E | 54 | 1012 |
| 14:00 | 18:00 | 32.4 | 36.7 | 0.03 | 0.3 | NW | 53 | 1012 |
| 15:00 | 19:00 | 32.1 | 35.9 | 0.05 | 1.2 | WNW | 55 | 1011 |
| 16:00 | 20:00 | 32.1 | 35.3 | 0.07 | 1.9 | WNW | 54 | 1011 |
| 17:00 | 21:00 | 32.6 | 36 | 0.02 | 2.2 | WNW | 55 | 1011 |
| 18:00 | 22:00 | 30.3 | 33.7 | 0.04 | 3.2 | WNW | 67 | 1010 |
| 19:00 | 23:00 | 29.6 | 33.5 | 0 | 2.1 | NW | 69 | 1011 |
| 20:00 | 00:00 | 27.6 | 31.4 | 0 | 2 | NNW | 75 | 1012 |
| 21:00 | 01:00 | 27.5 | 31.6 | 0 | 1.7 | N | 77 | 1012 |
| 22:00 | 02:00 | 28.5 | 32.6 | 0 | 1.6 | NE | 72 | 1013 |
| 23:00 | 03:00 | 28.2 | 32.9 | 0 | 1.3 | 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 27 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.