Home / Keystone / 23 September 2018
Keystone
United States · 23 September 2018
← 22 September 201824 September 2018 →
Average
27.1°C
low 23.6°C · high 32.4°C
Rainfall
4.2mm
rain recorded
Wind
2.2m/s
daily average
Humidity
79.5%
daily average
Cloud
48%
cover
Pressure
1015hPa
daily average
The temperature ranged from 23.6°C around 06:00 to 32.4°C around 15:00. Rain was recorded across 5 hours, from around 15:00 to 19:00 (4.2mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
76th percentile
Low temperature
67th percentile
Rainfall
68th percentile
Wind
52th 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 26.7°C, versus 27.1°C on this specific day.
Sun & daylight
Sunrise
07:18
Sunset
19:25
Day length
12h 6m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/New_York.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 04:00 | 26°C | 29.2°C | 0 | 2.6 | E | 81 | 1017 |
| 01:00 | 05:00 | 25.6°C | 28.7°C | 0 | 2.5 | E | 83 | 1016 |
| 02:00 | 06:00 | 25.4°C | 28.6°C | 0 | 2.5 | E | 84 | 1016 |
| 03:00 | 07:00 | 24.8°C | 27.7°C | 0 | 2.7 | E | 85 | 1015 |
| 04:00 | 08:00 | 24.3°C | 27.4°C | 0 | 2.6 | E | 88 | 1015 |
| 05:00 | 09:00 | 24°C | 27.1°C | 0 | 2.4 | E | 90 | 1014 |
| 06:00 | 10:00 | 23.6°C | 26.9°C | 0 | 1.8 | ENE | 89 | 1015 |
| 07:00 | 11:00 | 23.7°C | 27°C | 0 | 1.8 | ENE | 89 | 1015 |
| 08:00 | 12:00 | 23.8°C | 26.9°C | 0 | 2.2 | ENE | 88 | 1016 |
| 09:00 | 13:00 | 25.7°C | 29.5°C | 0 | 2.4 | ENE | 87 | 1016 |
| 10:00 | 14:00 | 27.5°C | 31.3°C | 0.01 | 2.8 | ENE | 81 | 1016 |
| 11:00 | 15:00 | 29.4°C | 32.1°C | 0.03 | 3.2 | E | 66 | 1017 |
| 12:00 | 16:00 | 30.2°C | 33.1°C | 0.03 | 2.8 | E | 63 | 1016 |
| 13:00 | 17:00 | 30.9°C | 34.2°C | 0.05 | 2.3 | E | 61 | 1016 |
| 14:00 | 18:00 | 32°C | 35.9°C | 0 | 2.2 | E | 60 | 1015 |
| 15:00 | 19:00 | 32.4°C | 37.4°C | 0.25 | 1.5 | E | 63 | 1015 |
| 16:00 | 20:00 | 31.8°C | 37.1°C | 2.53 | 1.3 | NE | 65 | 1014 |
| 17:00 | 21:00 | 29.7°C | 34.6°C | 0.37 | 2.1 | ENE | 76 | 1013 |
| 18:00 | 22:00 | 29.1°C | 34.5°C | 0.83 | 2.3 | SE | 83 | 1013 |
| 19:00 | 23:00 | 27.3°C | 32.4°C | 0.13 | 1.8 | ENE | 87 | 1014 |
| 20:00 | 00:00 | 26.6°C | 31.7°C | 0 | 1.2 | NE | 86 | 1015 |
| 21:00 | 01:00 | 25.9°C | 30°C | 0 | 1.8 | ENE | 86 | 1015 |
| 22:00 | 02:00 | 25.9°C | 29.7°C | 0 | 2 | E | 83 | 1016 |
| 23:00 | 03:00 | 25.7°C | 29.4°C | 0 | 2 | E | 84 | 1016 |
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 23 September 2018 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 (2026-07-21). 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 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Keystone, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 21, 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 2026-07-21},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.