Home / Williston / 12 May 2021
Williston
United States · 12 May 2021
Average
11°C
low 4.6°C · high 16.9°C
Rainfall
1.6mm
rain recorded
Wind
2.9m/s
daily average
Humidity
52.6%
daily average
Cloud
64%
cover
Pressure
1021hPa
daily average
The temperature ranged from 4.6°C around 04:00 to 16.9°C around 16:00. Rain was recorded across 3 hours, from around 08:00 to 20:00 (1.6mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
39th percentile
Low temperature
34th percentile
Rainfall
75th percentile
Wind
21th 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 12.6°C, versus 11°C on this specific day.
Sun & daylight
Sunrise
06:17
Sunset
21:23
Day length
15h 6m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Chicago.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | 7.4°C | 2.6°C | 0 | 3 | SSE | 38 | 1022 |
| 01:00 | 06:00 | 6.8°C | 2.1°C | 0 | 2.9 | SSE | 41 | 1022 |
| 02:00 | 07:00 | 6.7°C | 2.1°C | 0 | 2.8 | SSE | 43 | 1023 |
| 03:00 | 08:00 | 5.7°C | 1.3°C | 0 | 2.7 | S | 50 | 1022 |
| 04:00 | 09:00 | 4.6°C | 0.2°C | 0 | 2.7 | S | 53 | 1023 |
| 05:00 | 10:00 | 5.1°C | 0.7°C | 0 | 2.9 | SSE | 59 | 1022 |
| 06:00 | 11:00 | 5.6°C | 1.2°C | 0.01 | 3.1 | SSE | 58 | 1023 |
| 07:00 | 12:00 | 5.4°C | 1.6°C | 0.08 | 2.4 | SSE | 63 | 1023 |
| 08:00 | 13:00 | 5.1°C | 1.4°C | 0.28 | 2.6 | S | 71 | 1023 |
| 09:00 | 14:00 | 11.1°C | 8.1°C | 0.02 | 2.4 | S | 63 | 1023 |
| 10:00 | 15:00 | 13.1°C | 10°C | 0.11 | 2.6 | S | 55 | 1023 |
| 11:00 | 16:00 | 13.6°C | 10.5°C | 0.07 | 2.7 | S | 53 | 1022 |
| 12:00 | 17:00 | 16°C | 12.4°C | 0.07 | 3.4 | S | 46 | 1022 |
| 13:00 | 18:00 | 15.8°C | 11.7°C | 0.01 | 3.8 | S | 45 | 1021 |
| 14:00 | 19:00 | 16.5°C | 12.2°C | 0.03 | 4 | S | 41 | 1020 |
| 15:00 | 20:00 | 16.3°C | 12.2°C | 0.03 | 3.8 | SSW | 42 | 1020 |
| 16:00 | 21:00 | 16.9°C | 12.9°C | 0.02 | 3.6 | SSW | 40 | 1020 |
| 17:00 | 22:00 | 15.4°C | 11.5°C | 0.02 | 3.3 | SSW | 42 | 1020 |
| 18:00 | 23:00 | 16°C | 12.5°C | 0.02 | 2.7 | SW | 39 | 1020 |
| 19:00 | 00:00 | 15.9°C | 12.1°C | 0.01 | 3 | S | 38 | 1020 |
| 20:00 | 01:00 | 13.7°C | 11.2°C | 0.77 | 2.1 | SSE | 57 | 1020 |
| 21:00 | 02:00 | 11.5°C | 8.9°C | 0.03 | 2.5 | SSE | 70 | 1019 |
| 22:00 | 03:00 | 9.8°C | 7.2°C | 0 | 2.4 | SSE | 77 | 1020 |
| 23:00 | 04:00 | 9.7°C | 7.1°C | 0 | 2.3 | SE | 77 | 1020 |
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
- Williston — 48.250°, -103.500°, ERA5 grid cell center, 14.4 km from requested point
- Time zone
- America/Chicago
- What's shown here
- The hourly and daily record for 12 May 2021 specifically — not a monthly average. See the Williston 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 Williston, United States (48.25°N, 103.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Williston, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Williston, 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 Williston, 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.