How is the Tonight score calculated?

It scores forecast cloud, dew risk, aerosol transparency, astronomical-dark hours, nearby clear windows, and rain risk. It is weather-first — distinct from moon/Bortle scores on Sky Events.

Does this work outside Guyana?

Yes. Set any latitude and longitude. Guyana is the default demo because humid tropical nights need dew-aware scoring that still works worldwide.

Tools

Is Tonight Good for Stargazing? Free Score

One 0–100 score for tonight — Go, Maybe, or Skip — from cloud layers, dew risk, transparency, and astronomical dark.

Is tonight good for stargazing?

A free 0–100 Tonight score with Go / Maybe / Skip — cloud layers, dew risk, transparency, and astronomical dark for any lat/lon. Built in Guyana; works worldwide.

Georgetown

6.8000°N, 58.1700°W

Tonight score

Skip

46% cloud
watch dew
transparency n/a
no astro-dark window

Best clear window: Tuesday · good

Best night this week: Sat · score 53 (Maybe)

Full stargazing weather Tonight by city How the score is weighted

Score bands

70–100 Go — Clear enough to drive for.
45–69 Maybe — Watch dew and gaps.
0–44 Skip — Cloud, dew, or no dark window.

Frequently asked questions

Is tonight good for stargazing?: Use the Tonight score: 70+ is Go, 45–69 Maybe, under 45 Skip. It weighs cloud cover, dew risk, transparency, and whether you have astronomical dark. Open Stargazing Weather for hourly detail.
How is the Tonight score calculated?: It scores forecast cloud, dew risk, aerosol transparency, astronomical-dark hours, nearby clear windows, and rain risk. It is weather-first — distinct from moon/Bortle scores on Sky Events.
Does this work outside Guyana?: Yes. Set any latitude and longitude. Guyana is the default demo because humid tropical nights need dew-aware scoring that still works worldwide.

Pair with city hubs under Locations and the Is Tonight Good for Stargazing? lesson for FAQ-style planning.