Home / Frederick / 27 September 2018
Frederick
United States · 27 September 2018
← 26 September 201828 September 2018 →
Average
16.1°C
low 12.5°C · high 19.7°C
Rainfall
17.9mm
rain recorded
Wind
2.1m/s
daily average
Humidity
80.4%
daily average
Cloud
94%
cover
Pressure
1019hPa
daily average
The temperature ranged from 12.5°C around 21:00 to 19.7°C around 00:00. Rain was recorded across 10 hours, from around 14:00 to 23:00 (17.9mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
20th percentile
Low temperature
33th percentile
Rainfall
94th percentile
Wind
46th 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 18.7°C, versus 16.1°C on this specific day.
Sun & daylight
Sunrise
07:02
Sunset
18:58
Day length
11h 57m
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 | 19.7°C | 20.2°C | 0 | 3 | NW | 87 | 1018 |
| 01:00 | 05:00 | 19°C | 18.8°C | 0 | 3.4 | NNW | 85 | 1018 |
| 02:00 | 06:00 | 18.4°C | 17.8°C | 0 | 3.3 | NNW | 83 | 1018 |
| 03:00 | 07:00 | 18.2°C | 17.4°C | 0 | 3.3 | NNW | 79 | 1018 |
| 04:00 | 08:00 | 18.1°C | 17.2°C | 0 | 3.2 | N | 77 | 1018 |
| 05:00 | 09:00 | 17°C | 15.7°C | 0 | 3 | N | 74 | 1019 |
| 06:00 | 10:00 | 16.7°C | 15.6°C | 0 | 1.9 | NNE | 68 | 1020 |
| 07:00 | 11:00 | 16.3°C | 14.9°C | 0 | 2.5 | NNE | 70 | 1020 |
| 08:00 | 12:00 | 16.2°C | 15°C | 0 | 2.3 | NNE | 73 | 1021 |
| 09:00 | 13:00 | 16.9°C | 16.1°C | 0 | 1.9 | NE | 72 | 1022 |
| 10:00 | 14:00 | 17.3°C | 16.3°C | 0 | 2.3 | ENE | 70 | 1021 |
| 11:00 | 15:00 | 17.4°C | 16.1°C | 0 | 2 | ENE | 64 | 1021 |
| 12:00 | 16:00 | 17.6°C | 17.6°C | 0 | 0.4 | SE | 64 | 1021 |
| 13:00 | 17:00 | 17.7°C | 17.5°C | 0.01 | 0.4 | S | 63 | 1021 |
| 14:00 | 18:00 | 16.7°C | 16.9°C | 0.13 | 0.2 | ENE | 69 | 1021 |
| 15:00 | 19:00 | 16°C | 16°C | 2.69 | 1 | ENE | 79 | 1020 |
| 16:00 | 20:00 | 15.5°C | 14.9°C | 2.59 | 2 | ENE | 83 | 1019 |
| 17:00 | 21:00 | 14.5°C | 13.7°C | 1.8 | 2.6 | NE | 93 | 1018 |
| 18:00 | 22:00 | 13°C | 12.5°C | 0.67 | 1.8 | NNE | 98 | 1019 |
| 19:00 | 23:00 | 12.9°C | 12.5°C | 2.19 | 1.5 | ENE | 96 | 1019 |
| 20:00 | 00:00 | 12.7°C | 12°C | 1.75 | 2 | ENE | 96 | 1019 |
| 21:00 | 01:00 | 12.5°C | 11.4°C | 1.69 | 2.3 | ENE | 95 | 1018 |
| 22:00 | 02:00 | 12.6°C | 11.6°C | 2.04 | 2.2 | ENE | 95 | 1018 |
| 23:00 | 03:00 | 12.8°C | 12.4°C | 2.36 | 1.7 | NNE | 97 | 1018 |
Nearby cities
Need this verified for an official or legal purpose? Request a weather verification report.
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 27 September 2018 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
PastClimate (2026-07-19). 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/
PastClimate. (2026). Historical climate data for Frederick, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Frederick, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 19, 2026, www.pastclimate.com.
@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 2026-07-19},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.