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Frederick

United States · 28 September 2021

FrederickUnited States8:55 AM localChange location

← 27 September 202129 September 2021 →

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Average

19.9°C

low 15.7° · high 25°

Rainfall

1.9mm

rain recorded

Wind

2.6m/s

daily average

Humidity

76%

daily average

Cloud

51%

cover

Pressure

1012hPa

daily average

The temperature ranged from 15.7°C around 04:00 to 25°C around 17:00. Rain was recorded across 5 hours, from around 06:00 to 20:00 (1.9mm total).

How unusual was this day?

Compared against the same 135 calendar days (±7 days) across the other 9 years on file.

High temperature

61th percentile

Low temperature

61th percentile

Rainfall

68th percentile

Wind

66th 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 18.6°C, versus 19.9°C on this specific day.

Sun & daylight

Sunrise

07:03

Sunset

18:56

Day length

11h 53m

Hour by hour

Temperature (line) and hourly rainfall (bars), local time — America/New_York.

↓ Download CSV
00:0006:0012:0018:0023:00

Cumulative rainfall through the day.

00:0006:0012:0018:0023:00
Local timeUTCTemp °CFeels °CRain mmWind m/sDirHumidity %Pressure hPa
00:0004:0017.816.602.8SW711013
01:0005:0017.11602.7SW751013
02:0006:0016.315.302.6SSW791012
03:0007:0016.215.302.4SSW791012
04:0008:0015.71502.2SSW821012
05:0009:0015.915.701.7SW841012
06:0010:0015.915.20.142.6SW861011
07:0011:0016.616.20.032.2W841013
08:0012:0016.716.901.6SW851013
09:0013:0017.617.80.342SSW841012
10:0014:0018.719.30.422SW841012
11:0015:0020.621.80.432.2WSW841012
12:0016:0022.222.30.023.9W761012
13:0017:0023.522.90.024.4W671011
14:0018:0024.223.90.094WNW651011
15:0019:0024.224.20.023.5NW651011
16:0020:0024.724.50.073.7NW631011
17:0021:002525.20.043.2NW621011
18:0022:0024.325.30.041.9WSW631011
19:0023:0022.423.50.081.8W711011
20:0000:0021.722.50.12.3WNW741012
21:0001:0021.221.90.062.2WNW761013
22:0002:0020.320.80.012.5WNW801013
23:0003:001919.102.8NW841014

Same date, other years

202520242023202220202019201820172016

Nearby cities

Thurmont

0km away, same day

Middletown

0km away, same day

Clover Hill

0km away, same day

Braddock Heights

0km away, same day

Halfway

21.5km away, same day

Mount Airy

21.5km away, same day

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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
Frederick — 39.500°, -77.500°, ERA5 grid cell center, 12.2 km from requested point
Time zone
America/New_York
What's shown here
The hourly and daily record for 28 September 2021 specifically — not a monthly average. See the Frederick 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

Plain text
PastClimate (2026-07-17). Historical climate data for Frederick, United States (39.50°N, 77.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
APA
PastClimate. (2026). Historical climate data for Frederick, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
MLA
"Historical Climate Data for Frederick, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
BibTeX
@misc{pastclimate,
  author = {PastClimate},
  title = {Historical climate data for Frederick, 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/}
}

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