Exactly what it says on the tin. 30 kinds of weather for your gritty dystopian/dark future. A good mix of realistic weather and the sort of nastiness you'd expect in a grim future due to pollution and climate change.

If you don't have a D30, roll a D10 then roll a D6 as a "control die" - on a 1 or 2, don't add anything to the value on the D10, on a 3 or 4 add 10 to the value of the D10 and on 5 or 6 add 20 to the value on the D10.

System-agnostic so it will work for any Cyberpunk-ish Dark Future game and give more options than constant rain or smog.