I made a little table for my Riskland campaign a while ago. It's based on d100. (And heavily influenced by our Western Washington weather.)
01-05 bright and sunny; dead calm wind 06-15 bright and sunny; slight breeze 16-25 sunny, breeze 26- 30 partly cloudy, dead calm wind 31-40 partly cloudy, slight breeze 41-50 partly cloudy; breeze 51-55 partly cloudy; windy 56-60 mostly cloudy, breeze 61-70 mostly cloudy, windy 71-75 cloudy; drizzle, dead calm 76-80 cloudy; light rain, breeze 81-85 cloudy; rain, dead calm 86-90 cloudy; heavy rain; breeze 91-95 very cloudy; heavy rain; windy 96-100 - thunderstorm
Modifiers
Fireseason: -15
Earthseason: none
Dark Season: none. rain = snow
Storm Season: +15
Seaseason: none
Sacredtime - magical influences (wing it)
You might want to modify this somewhat for extreme climates, such as Prax or Farpoint.
Pam
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