Home / Romulus / 4 January 2021
Romulus
United States · 4 January 2021
← 3 January 20215 January 2021 →
Average
0.4°C
low -0.4°C · high 1°C
Rainfall
0.1mm
dry day
Wind
1.9m/s
daily average
Humidity
83.5%
daily average
Cloud
97%
cover
Pressure
1017hPa
daily average
The temperature ranged from -0.4°C around 22:00 to 1°C around 12:00. 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
38th percentile
Low temperature
73th percentile
Rainfall
37th percentile
Wind
3th 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 -1.2°C, versus 0.4°C on this specific day.
Sun & daylight
Sunrise
08:02
Sunset
17:15
Day length
9h 13m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Detroit.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | 0.5°C | -2.3°C | 0.01 | 1 | WSW | 88 | 1017 |
| 01:00 | 06:00 | 0.5°C | -2.4°C | 0.02 | 1.1 | WSW | 90 | 1017 |
| 02:00 | 07:00 | 0.4°C | -2.7°C | 0.01 | 1.3 | W | 89 | 1018 |
| 03:00 | 08:00 | -0.1°C | -3.2°C | 0.02 | 1.2 | W | 88 | 1018 |
| 04:00 | 09:00 | -0.4°C | -3.6°C | 0 | 1.4 | W | 90 | 1018 |
| 05:00 | 10:00 | 0.2°C | -2.8°C | 0.01 | 1.1 | WSW | 87 | 1018 |
| 06:00 | 11:00 | 0.4°C | -2.6°C | 0.01 | 1.1 | SW | 86 | 1018 |
| 07:00 | 12:00 | 0.5°C | -2.8°C | 0.01 | 1.5 | SW | 87 | 1019 |
| 08:00 | 13:00 | 0.5°C | -2.8°C | 0.01 | 1.7 | SW | 86 | 1019 |
| 09:00 | 14:00 | 0.5°C | -3.1°C | 0.01 | 1.9 | SW | 86 | 1019 |
| 10:00 | 15:00 | 0.8°C | -3.1°C | 0 | 2.3 | SW | 80 | 1019 |
| 11:00 | 16:00 | 0.7°C | -3.1°C | 0 | 2.1 | SW | 81 | 1018 |
| 12:00 | 17:00 | 1°C | -2.9°C | 0 | 2.3 | SSW | 79 | 1017 |
| 13:00 | 18:00 | 0.9°C | -3.2°C | 0 | 2.7 | SSW | 80 | 1016 |
| 14:00 | 19:00 | 0.9°C | -3.3°C | 0 | 2.8 | SSW | 80 | 1016 |
| 15:00 | 20:00 | 0.8°C | -3.5°C | 0 | 2.9 | SSW | 79 | 1016 |
| 16:00 | 21:00 | 0.9°C | -3.6°C | 0 | 3 | SSW | 78 | 1016 |
| 17:00 | 22:00 | 0.5°C | -3.5°C | 0 | 2.4 | SSW | 78 | 1016 |
| 18:00 | 23:00 | 0.3°C | -3.5°C | 0 | 2.1 | SSW | 80 | 1016 |
| 19:00 | 00:00 | 0.2°C | -3.7°C | 0 | 2.2 | SSW | 81 | 1016 |
| 20:00 | 01:00 | 0.5°C | -3.4°C | 0 | 2.1 | SSW | 80 | 1016 |
| 21:00 | 02:00 | 0.4°C | -3.3°C | 0 | 1.9 | SSW | 81 | 1015 |
| 22:00 | 03:00 | -0.4°C | -3.9°C | 0 | 1.6 | SSW | 85 | 1015 |
| 23:00 | 04:00 | -0.1°C | -3.4°C | 0 | 1.4 | SW | 83 | 1015 |
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
- Romulus — 42.250°, -83.500°, ERA5 grid cell center, 9.1 km from requested point
- Time zone
- America/Detroit
- What's shown here
- The hourly and daily record for 4 January 2021 specifically — not a monthly average. See the Romulus 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 (2026-07-20). Historical climate data for Romulus, United States (42.25°N, 83.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Romulus, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Romulus, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 20, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Romulus, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-20},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.