Home / Spearfish / 31 May 2018
Spearfish
United States · 31 May 2018
Average
20.6°C
low 12.4°C · high 27.9°C
Rainfall
0.1mm
dry day
Wind
2.2m/s
daily average
Humidity
59.4%
daily average
Cloud
41%
cover
Pressure
1003hPa
daily average
The temperature ranged from 12.4°C around 03:00 to 27.9°C around 14:00. 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
89th percentile
Low temperature
81th percentile
Rainfall
35th percentile
Wind
16th 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 15.6°C, versus 20.6°C on this specific day.
Sun & daylight
Sunrise
05:13
Sunset
20:32
Day length
15h 18m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Denver.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 06:00 | 13.8°C | 12.2°C | 0 | 2.7 | S | 83 | 1005 |
| 01:00 | 07:00 | 13.7°C | 11.8°C | 0 | 2.9 | S | 80 | 1005 |
| 02:00 | 08:00 | 13.5°C | 11.6°C | 0 | 2.8 | S | 80 | 1004 |
| 03:00 | 09:00 | 12.4°C | 10.1°C | 0 | 2.8 | S | 78 | 1004 |
| 04:00 | 10:00 | 13.8°C | 12.1°C | 0 | 2.8 | SSW | 80 | 1004 |
| 05:00 | 11:00 | 14°C | 12.3°C | 0 | 2.7 | SSW | 79 | 1004 |
| 06:00 | 12:00 | 13.8°C | 12°C | 0 | 2.8 | SSW | 80 | 1004 |
| 07:00 | 13:00 | 14.2°C | 12.6°C | 0 | 2.7 | S | 79 | 1004 |
| 08:00 | 14:00 | 17.7°C | 16.9°C | 0 | 2.2 | SSE | 71 | 1004 |
| 09:00 | 15:00 | 23.8°C | 23.4°C | 0 | 2 | SE | 52 | 1004 |
| 10:00 | 16:00 | 24.7°C | 24.3°C | 0 | 2.1 | SE | 50 | 1004 |
| 11:00 | 17:00 | 26.6°C | 25.1°C | 0 | 3.7 | SE | 44 | 1004 |
| 12:00 | 18:00 | 27.4°C | 25.7°C | 0.03 | 3.9 | SSE | 42 | 1003 |
| 13:00 | 19:00 | 27.7°C | 25.9°C | 0.03 | 3.6 | S | 39 | 1003 |
| 14:00 | 20:00 | 27.9°C | 26.7°C | 0.05 | 2.5 | SSW | 37 | 1002 |
| 15:00 | 21:00 | 27.6°C | 26.3°C | 0.02 | 2 | SW | 34 | 1002 |
| 16:00 | 22:00 | 27.3°C | 26.6°C | 0 | 1.1 | SW | 35 | 1001 |
| 17:00 | 23:00 | 27.2°C | 27.1°C | 0 | 0.4 | WNW | 35 | 1001 |
| 18:00 | 00:00 | 26.5°C | 26.7°C | 0 | 0.8 | NNE | 43 | 1000 |
| 19:00 | 01:00 | 24.8°C | 25.6°C | 0 | 0.8 | NE | 52 | 1000 |
| 20:00 | 02:00 | 22.5°C | 22.9°C | 0 | 0.9 | NE | 56 | 1001 |
| 21:00 | 03:00 | 18°C | 18.2°C | 0 | 0.7 | NE | 70 | 1002 |
| 22:00 | 04:00 | 18.3°C | 17.5°C | 0 | 1.8 | SE | 66 | 1002 |
| 23:00 | 05:00 | 18.6°C | 17.4°C | 0 | 2.2 | SSE | 61 | 1002 |
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
- Spearfish — 44.500°, -103.750°, ERA5 grid cell center, 8.7 km from requested point
- Time zone
- America/Denver
- What's shown here
- The hourly and daily record for 31 May 2018 specifically — not a monthly average. See the Spearfish 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 Spearfish, United States (44.50°N, 103.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Spearfish, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Spearfish, 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 Spearfish, 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.