1.6 usable nights
0–2 in the middle half of years · 0.6 typically near a dark moon.
341 astronomical-dark hours in an average month
20-year trip-planning baseline
Best time to stargaze at Myrtle Beach
October: 10.9 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.18.9–19.6 mag/arcsec²
The short answer
October has been strongest.
It averages 10.9 usable nights, versus 1.3 in February. A typical October lands between 8 and 12 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
1.3 usable nights
0–2 in the middle half of years · 0.3 typically near a dark moon.
287 astronomical-dark hours in an average month
3.3 usable nights
1–4 in the middle half of years · 1.1 typically near a dark moon.
288 astronomical-dark hours in an average month
8.8 usable nights
8–10 in the middle half of years · 3.4 typically near a dark moon.
240 astronomical-dark hours in an average month
9.5 usable nights
8–10 in the middle half of years · 2.6 typically near a dark moon.
208 astronomical-dark hours in an average month
6.2 usable nights
4–7 in the middle half of years · 2.3 typically near a dark moon.
180 astronomical-dark hours in an average month
5.2 usable nights
3–8 in the middle half of years · 1.4 typically near a dark moon.
193 astronomical-dark hours in an average month
4.8 usable nights
3–7 in the middle half of years · 1.9 typically near a dark moon.
243 astronomical-dark hours in an average month
7.0 usable nights
4–10 in the middle half of years · 2.3 typically near a dark moon.
257 astronomical-dark hours in an average month
10.9 usable nights
8–12 in the middle half of years · 3.6 typically near a dark moon.
310 astronomical-dark hours in an average month
6.8 usable nights
5–8 in the middle half of years · 1.8 typically near a dark moon.
326 astronomical-dark hours in an average month
2.5 usable nights
0–3 in the middle half of years · 0.8 typically near a dark moon.
353 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.