3.8 usable nights
0–7 in the middle half of years · 1.1 typically near a dark moon.
353 astronomical-dark hours in an average month
20-year trip-planning baseline
Best time to stargaze at Klamath Falls
July: 23.1 usable nights on average. Use this seasonal climate baseline to choose a month, then use the live forecast to choose a night.
Site darkness · modelled, not measured
Brightened skyBortle classes describe observed sky conditions; this brightness model does not establish a measured Bortle class.20.8–21.3 mag/arcsec²
The short answer
July has been strongest.
It averages 23.1 usable nights, versus 3.3 in December. A typical July lands between 22 and 26 usable nights.
Record2005–2024 · 20 complete years
Usable nightAt least 3 astronomical-dark hours and NASA POWER nighttime cloud ≤30%
Dark-moon nightUsable night with ≤25% illumination at local solar midnight
ResolutionCERES SYN1deg 1° cloud grid; regional climate, not a campsite guarantee
Seasonal fingerprint
Usable nights by month
Month by month
4.8 usable nights
1–7 in the middle half of years · 1.4 typically near a dark moon.
291 astronomical-dark hours in an average month
5.5 usable nights
4–8 in the middle half of years · 1.8 typically near a dark moon.
273 astronomical-dark hours in an average month
6.5 usable nights
4–8 in the middle half of years · 2.1 typically near a dark moon.
218 astronomical-dark hours in an average month
10.7 usable nights
8–13 in the middle half of years · 4.0 typically near a dark moon.
172 astronomical-dark hours in an average month
15.6 usable nights
13–18 in the middle half of years · 5.4 typically near a dark moon.
120 astronomical-dark hours in an average month
23.1 usable nights
22–26 in the middle half of years · 7.8 typically near a dark moon.
151 astronomical-dark hours in an average month
21.4 usable nights
19–24 in the middle half of years · 7.7 typically near a dark moon.
204 astronomical-dark hours in an average month
17.6 usable nights
15–20 in the middle half of years · 6.4 typically near a dark moon.
247 astronomical-dark hours in an average month
12.0 usable nights
8–16 in the middle half of years · 3.5 typically near a dark moon.
305 astronomical-dark hours in an average month
4.3 usable nights
2–7 in the middle half of years · 1.3 typically near a dark moon.
330 astronomical-dark hours in an average month
3.3 usable nights
2–5 in the middle half of years · 0.9 typically near a dark moon.
371 astronomical-dark hours in an average month
Use the baseline honestly
Climate chooses the month. Forecasts choose the night.
The cloud product is a roughly 1° regional grid. It can reveal seasonality, but it cannot know a mountain ridge, valley fog pocket, locked gate, smoke event or the exact sky you will get.
Source: NASA POWER daily data, parameter CLOUD_AMT_NIGHT from the CERES SYN1deg cloud product. GoodSeeing calculates astronomical darkness and lunar illumination independently for each place.