11.0 usable nights
8–14 in the middle half of years · 3.5 typically near a dark moon.
345 astronomical-dark hours in an average month
20-year trip-planning baseline
Best time to stargaze at Durango
June: 16.4 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.20.7–21.1 mag/arcsec²
The short answer
June has been strongest.
It averages 16.4 usable nights, versus 8.2 in March. A typical June lands between 13 and 19 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
9.2 usable nights
6–11 in the middle half of years · 3.3 typically near a dark moon.
289 astronomical-dark hours in an average month
8.2 usable nights
5–11 in the middle half of years · 2.3 typically near a dark moon.
282 astronomical-dark hours in an average month
8.9 usable nights
7–11 in the middle half of years · 2.6 typically near a dark moon.
239 astronomical-dark hours in an average month
11.1 usable nights
8–14 in the middle half of years · 3.6 typically near a dark moon.
188 astronomical-dark hours in an average month
16.4 usable nights
13–19 in the middle half of years · 5.7 typically near a dark moon.
180 astronomical-dark hours in an average month
9.3 usable nights
5–12 in the middle half of years · 3.5 typically near a dark moon.
186 astronomical-dark hours in an average month
10.7 usable nights
7–13 in the middle half of years · 3.0 typically near a dark moon.
228 astronomical-dark hours in an average month
15.3 usable nights
12–18 in the middle half of years · 5.2 typically near a dark moon.
252 astronomical-dark hours in an average month
15.4 usable nights
12–20 in the middle half of years · 5.3 typically near a dark moon.
309 astronomical-dark hours in an average month
13.4 usable nights
10–16 in the middle half of years · 4.5 typically near a dark moon.
328 astronomical-dark hours in an average month
9.2 usable nights
6–11 in the middle half of years · 2.5 typically near a dark moon.
363 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.