From publisher blurb:
Adding weather to your fantasy adventure game campaign can be fun, but most systems are either too simple to be satisfying or too complicated to be practical. SEVEN YEARS of FANTASY WEATHER gives you seven years of realistic weather for 5112 separate days and nights. Each day/eve includes weather events if applicable - thunderstorm, fog, blizzard, sandstorm, etc. - amount of rainfall/snowfall, occurrence of lightning (or possibly divinely influenced rainbows), temperature, wind speed, wind direction, phases of the moon, effect on movement rates and chances of getting lost. It's an almanac for the fantasy gamer. No more annoying die rolling or consulting an online program to find out that the weather is clear and 65 degrees. With FANTASY WEATHER you can see all of it at a glance. Whether you're using Dungeons & Dragons 5e, an OSR retro-clone or any other current or past game or mechanic, this is the last word on weather for your roleplaying needs, This first volume simulates the weather patterns of Medieval England, but other volumes are forthcoming. Guard the innocent! Avenge the wronged! May you find glory and justice in your wilderness wanderings. But God grant that the wind be always at your back!