6.8 usable nights
4–9 in the middle half of years · 2.1 typically near a dark moon.
326 astronomical-dark hours in an average month
20-year trip-planning baseline
Best time to stargaze at Corpus Christi
October: 17.9 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
Bright skyBortle classes describe observed sky conditions; this brightness model does not establish a measured Bortle class.18.7–19.5 mag/arcsec²
The short answer
October has been strongest.
It averages 17.9 usable nights, versus 5.5 in April. A typical October lands between 15 and 21 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
5.7 usable nights
4–8 in the middle half of years · 1.9 typically near a dark moon.
283 astronomical-dark hours in an average month
5.8 usable nights
4–8 in the middle half of years · 1.8 typically near a dark moon.
298 astronomical-dark hours in an average month
5.5 usable nights
4–6 in the middle half of years · 2.1 typically near a dark moon.
242 astronomical-dark hours in an average month
6.5 usable nights
4–9 in the middle half of years · 2.0 typically near a dark moon.
248 astronomical-dark hours in an average month
15.2 usable nights
12–18 in the middle half of years · 4.3 typically near a dark moon.
222 astronomical-dark hours in an average month
14.7 usable nights
12–19 in the middle half of years · 5.8 typically near a dark moon.
235 astronomical-dark hours in an average month
16.8 usable nights
14–20 in the middle half of years · 5.9 typically near a dark moon.
248 astronomical-dark hours in an average month
15.8 usable nights
15–19 in the middle half of years · 5.3 typically near a dark moon.
271 astronomical-dark hours in an average month
17.9 usable nights
15–21 in the middle half of years · 6.5 typically near a dark moon.
310 astronomical-dark hours in an average month
10.4 usable nights
6–14 in the middle half of years · 3.7 typically near a dark moon.
317 astronomical-dark hours in an average month
6.8 usable nights
4–9 in the middle half of years · 2.5 typically near a dark moon.
321 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.