Weather Analysis
1408 readings for Boulder, CO, covering 61 days from 2026-09-04 to 2026-11-03.
Summary statistics
17.1°C
Mean temperature
6.8°C
Standard deviation
2.1°C
Coldest, 2026-10-16
33.9°C
Warmest, 2026-09-13
45.7%
Mean humidity
8.0
Mean wind, km/h
Daily temperature cycle
Averaging every reading by hour of day cancels out day-to-day weather and leaves the daily cycle: coolest at 07:00 (11.9°C), warmest at 15:00 (23.3°C) — a swing of 11.4°C.
00
06
12
18
Patterns
- Temperature trend
- -0.238°C per day by least squares, or about -14.5°C across the whole period.
- Temperature against humidity
- Pearson r = -0.744. The two move in opposite directions: the warmer hours are the drier ones.
Conditions observed
| Condition | Readings | Share |
|---|---|---|
| Overcast | 608 | 43.2% |
| Clear sky | 600 | 42.6% |
| Partly cloudy | 89 | 6.3% |
| Mainly clear | 60 | 4.3% |
| Fog | 17 | 1.2% |
| Light drizzle | 15 | 1.1% |
| Slight rain | 8 | 0.6% |
| Moderate drizzle | 6 | 0.4% |
| Moderate rain | 2 | 0.1% |
| Dense drizzle | 2 | 0.1% |
| Heavy rain | 1 | 0.1% |