Potomac
United States · 6 July 2016
Average
28.4°C
low 23.5°C · high 32.6°C
Rainfall
0mm
dry day
Wind
1.8m/s
daily average
Humidity
68%
daily average
Cloud
37%
cover
Pressure
1012hPa
daily average
The temperature ranged from 23.5°C around 05:00 to 32.6°C around 18:00. 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
60th percentile
Low temperature
76th percentile
Rainfall
36th percentile
Wind
24th 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 28.4°C on this specific day.
Sun & daylight
Sunrise
05:50
Sunset
20:37
Day length
14h 47m
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 | 26.1°C | 30°C | 0 | 1.4 | W | 80 | 1012 |
| 01:00 | 05:00 | 25.3°C | 28.7°C | 0 | 1.6 | WNW | 80 | 1012 |
| 02:00 | 06:00 | 24.7°C | 27.7°C | 0 | 1.9 | WNW | 82 | 1012 |
| 03:00 | 07:00 | 24.4°C | 27.4°C | 0 | 2 | W | 83 | 1012 |
| 04:00 | 08:00 | 23.9°C | 27°C | 0 | 1.8 | W | 85 | 1012 |
| 05:00 | 09:00 | 23.5°C | 26.5°C | 0 | 1.9 | WNW | 87 | 1012 |
| 06:00 | 10:00 | 24.3°C | 27.2°C | 0 | 1.9 | NW | 82 | 1013 |
| 07:00 | 11:00 | 24.7°C | 27.5°C | 0 | 2.2 | NW | 81 | 1013 |
| 08:00 | 12:00 | 26.2°C | 29.7°C | 0 | 1.9 | NW | 78 | 1013 |
| 09:00 | 13:00 | 27.4°C | 31.3°C | 0 | 2 | NW | 78 | 1013 |
| 10:00 | 14:00 | 28.6°C | 32.6°C | 0.02 | 1.7 | NW | 72 | 1013 |
| 11:00 | 15:00 | 30.6°C | 33.3°C | 0.01 | 1.3 | NW | 53 | 1013 |
| 12:00 | 16:00 | 31.2°C | 34°C | 0 | 1.1 | WNW | 51 | 1013 |
| 13:00 | 17:00 | 31.5°C | 34.2°C | 0 | 1.4 | WNW | 50 | 1013 |
| 14:00 | 18:00 | 32.3°C | 35.1°C | 0.01 | 1.8 | W | 50 | 1012 |
| 15:00 | 19:00 | 32.3°C | 34.7°C | 0 | 2.2 | W | 50 | 1011 |
| 16:00 | 20:00 | 32.2°C | 34.6°C | 0 | 2.1 | W | 50 | 1011 |
| 17:00 | 21:00 | 32.5°C | 35.3°C | 0 | 1.8 | W | 50 | 1010 |
| 18:00 | 22:00 | 32.6°C | 34.9°C | 0 | 2.6 | WNW | 50 | 1010 |
| 19:00 | 23:00 | 31.8°C | 35.9°C | 0 | 0.7 | SW | 56 | 1010 |
| 20:00 | 00:00 | 30.8°C | 34.9°C | 0 | 1.2 | SSE | 61 | 1010 |
| 21:00 | 01:00 | 29.3°C | 32.4°C | 0 | 2 | S | 64 | 1010 |
| 22:00 | 02:00 | 27.9°C | 31.1°C | 0 | 2.5 | SSW | 72 | 1011 |
| 23:00 | 03:00 | 26.4°C | 30.3°C | 0 | 2.6 | SSW | 86 | 1011 |
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
- Potomac — 39.000°, -77.250°, ERA5 grid cell center, 4.1 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 6 July 2016 specifically — not a monthly average. See the Potomac 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 (2026-07-18). Historical climate data for Potomac, United States (39.00°N, 77.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Potomac, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Potomac, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 18, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Potomac, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-18},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.