3.0 usable nights
1–5 in the middle half of years · 0.5 typically near a dark moon.
352 astronomical-dark hours in an average month
20-year trip-planning baseline
Best time to stargaze at Laramie
September: 13.2 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.20.4–20.9 mag/arcsec²
The short answer
September has been strongest.
It averages 13.2 usable nights, versus 3.0 in January. A typical September lands between 12 and 16 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
3.1 usable nights
1–4 in the middle half of years · 0.7 typically near a dark moon.
291 astronomical-dark hours in an average month
4.8 usable nights
3–6 in the middle half of years · 1.4 typically near a dark moon.
275 astronomical-dark hours in an average month
4.3 usable nights
2–6 in the middle half of years · 1.3 typically near a dark moon.
222 astronomical-dark hours in an average month
5.5 usable nights
2–8 in the middle half of years · 1.6 typically near a dark moon.
182 astronomical-dark hours in an average month
9.7 usable nights
8–11 in the middle half of years · 3.4 typically near a dark moon.
120 astronomical-dark hours in an average month
10.7 usable nights
9–13 in the middle half of years · 3.1 typically near a dark moon.
160 astronomical-dark hours in an average month
10.4 usable nights
9–12 in the middle half of years · 4.1 typically near a dark moon.
208 astronomical-dark hours in an average month
13.2 usable nights
12–16 in the middle half of years · 4.7 typically near a dark moon.
248 astronomical-dark hours in an average month
9.7 usable nights
8–12 in the middle half of years · 3.0 typically near a dark moon.
305 astronomical-dark hours in an average month
5.1 usable nights
3–8 in the middle half of years · 1.6 typically near a dark moon.
330 astronomical-dark hours in an average month
3.1 usable nights
2–4 in the middle half of years · 1.1 typically near a dark moon.
370 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.