Boulder
United States · 11 June 2018
Average
5.6°C
low 1°C · high 9.1°C
Rainfall
3.6mm
rain recorded
Wind
3m/s
daily average
Humidity
58.9%
daily average
Cloud
51%
cover
Pressure
1015hPa
daily average
The temperature ranged from 1°C around 03:00 to 9.1°C around 19:00. Rain was recorded across 6 hours, from around 11:00 to 16:00 (3.6mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
4th percentile
Low temperature
5th percentile
Rainfall
70th percentile
Wind
85th 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 13.4°C, versus 5.6°C on this specific day.
Sun & daylight
Sunrise
05:35
Sunset
21:19
Day length
15h 44m
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 | 4.5°C | 0.6°C | 0 | 1.9 | WSW | 51 | 1014 |
| 01:00 | 07:00 | 4.1°C | 0.4°C | 0 | 1.6 | WSW | 51 | 1014 |
| 02:00 | 08:00 | 2.8°C | -1°C | 0 | 1.8 | SW | 59 | 1015 |
| 03:00 | 09:00 | 1°C | -2.8°C | 0 | 1.7 | SW | 67 | 1014 |
| 04:00 | 10:00 | 1.4°C | -2.1°C | 0 | 1.5 | SW | 72 | 1015 |
| 05:00 | 11:00 | 1.9°C | -1.4°C | 0 | 1.4 | SW | 73 | 1015 |
| 06:00 | 12:00 | 2°C | -1.2°C | 0.01 | 1.4 | SW | 77 | 1016 |
| 07:00 | 13:00 | 3.3°C | 0°C | 0.01 | 1.5 | SW | 72 | 1016 |
| 08:00 | 14:00 | 4.3°C | 0.7°C | 0.01 | 1.9 | SW | 63 | 1015 |
| 09:00 | 15:00 | 7°C | 2.6°C | 0.09 | 3 | WSW | 55 | 1015 |
| 10:00 | 16:00 | 7.4°C | 3.3°C | 0.07 | 2.9 | WSW | 58 | 1014 |
| 11:00 | 17:00 | 7.9°C | 4.1°C | 0.15 | 2.7 | WSW | 61 | 1014 |
| 12:00 | 18:00 | 8.1°C | 4.8°C | 0.4 | 2.5 | W | 69 | 1013 |
| 13:00 | 19:00 | 6.5°C | 3°C | 0.36 | 2.9 | WNW | 80 | 1013 |
| 14:00 | 20:00 | 6.6°C | 2.5°C | 1.38 | 3.6 | NW | 76 | 1015 |
| 15:00 | 21:00 | 7.5°C | 2.5°C | 0.94 | 4.2 | WNW | 58 | 1015 |
| 16:00 | 22:00 | 8.7°C | 3.5°C | 0.11 | 4.6 | W | 56 | 1016 |
| 17:00 | 23:00 | 9.1°C | 2.2°C | 0.06 | 6.6 | WNW | 47 | 1016 |
| 18:00 | 00:00 | 8.8°C | 2°C | 0.01 | 6.3 | WNW | 43 | 1016 |
| 19:00 | 01:00 | 9.1°C | 2.8°C | 0 | 5.5 | W | 40 | 1016 |
| 20:00 | 02:00 | 8.9°C | 3.2°C | 0 | 4.5 | W | 39 | 1017 |
| 21:00 | 03:00 | 6.2°C | 1.3°C | 0 | 3.2 | W | 43 | 1018 |
| 22:00 | 04:00 | 4.6°C | 0°C | 0 | 2.8 | WSW | 48 | 1018 |
| 23:00 | 05:00 | 3.4°C | -0.8°C | 0 | 2.3 | WSW | 55 | 1019 |
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
- Boulder — 46.250°, -112.000°, ERA5 grid cell center, 9.4 km from requested point
- Time zone
- America/Denver
- What's shown here
- The hourly and daily record for 11 June 2018 specifically — not a monthly average. See the Boulder 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 Boulder, United States (46.25°N, 112.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Boulder, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Boulder, 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 Boulder, 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.