Home / Back Mountain / 31 August 2021
Back Mountain
United States · 31 August 2021
← 30 August 20211 September 2021 →
Average
22.1°C
low 17.5°C · high 26.7°C
Rainfall
0mm
dry day
Wind
1.6m/s
daily average
Humidity
74.9%
daily average
Cloud
97%
cover
Pressure
1010hPa
daily average
The temperature ranged from 17.5°C around 06:00 to 26.7°C around 15:00. 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
67th percentile
Low temperature
64th percentile
Rainfall
41th percentile
Wind
11th 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 20.1°C, versus 22.1°C on this specific day.
Sun & daylight
Sunrise
06:29
Sunset
19:37
Day length
13h 8m
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 | 20.6°C | 22.9°C | 0 | 1.6 | NW | 92 | 1010 |
| 01:00 | 05:00 | 19.7°C | 21.6°C | 0 | 1.5 | NW | 93 | 1010 |
| 02:00 | 06:00 | 19.5°C | 21.6°C | 0 | 1.4 | WNW | 94 | 1010 |
| 03:00 | 07:00 | 19.1°C | 21°C | 0 | 1.5 | WNW | 95 | 1010 |
| 04:00 | 08:00 | 18.9°C | 20.6°C | 0 | 1.7 | NW | 96 | 1010 |
| 05:00 | 09:00 | 18.4°C | 19.9°C | 0 | 1.7 | NW | 96 | 1010 |
| 06:00 | 10:00 | 17.5°C | 18.7°C | 0 | 1.8 | NNW | 97 | 1010 |
| 07:00 | 11:00 | 17.8°C | 19.2°C | 0 | 1.4 | N | 96 | 1011 |
| 08:00 | 12:00 | 18.7°C | 20.8°C | 0 | 1 | NNW | 96 | 1011 |
| 09:00 | 13:00 | 19.9°C | 22.4°C | 0 | 0.5 | N | 89 | 1011 |
| 10:00 | 14:00 | 21°C | 23.8°C | 0 | 0.4 | ENE | 86 | 1011 |
| 11:00 | 15:00 | 23.8°C | 26°C | 0 | 0.5 | SE | 67 | 1011 |
| 12:00 | 16:00 | 25.1°C | 26.2°C | 0 | 1.1 | W | 55 | 1011 |
| 13:00 | 17:00 | 26.2°C | 26.4°C | 0 | 1.9 | W | 49 | 1010 |
| 14:00 | 18:00 | 26.5°C | 26°C | 0 | 2.4 | WNW | 46 | 1010 |
| 15:00 | 19:00 | 26.7°C | 26.3°C | 0 | 2.3 | WNW | 45 | 1009 |
| 16:00 | 20:00 | 26.6°C | 26.4°C | 0.01 | 1.8 | W | 44 | 1009 |
| 17:00 | 21:00 | 26.1°C | 27°C | 0 | 1 | WSW | 51 | 1009 |
| 18:00 | 22:00 | 25.1°C | 26.5°C | 0 | 1.1 | SW | 58 | 1009 |
| 19:00 | 23:00 | 24°C | 25.2°C | 0 | 1.6 | SSW | 64 | 1009 |
| 20:00 | 00:00 | 23.1°C | 23.3°C | 0 | 2.6 | SSW | 66 | 1009 |
| 21:00 | 01:00 | 22.5°C | 22.5°C | 0 | 2.9 | SW | 69 | 1009 |
| 22:00 | 02:00 | 21.9°C | 22.4°C | 0 | 2.6 | SW | 73 | 1010 |
| 23:00 | 03:00 | 20.8°C | 21.9°C | 0 | 2 | WSW | 80 | 1010 |
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
- Back Mountain — 41.250°, -76.000°, ERA5 grid cell center, 9.6 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 31 August 2021 specifically — not a monthly average. See the Back Mountain 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 Back Mountain, United States (41.25°N, 76.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Back Mountain, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Back Mountain, 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 Back Mountain, 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.