Beginner Looking For Assistance With Aluminum Casting

The following results are what I feel are correct for a generic region that legitimately has four separate seasons. I didn't reference any scientific data because that'd take way too long and I don't care that much. Please critique at will. It's entirely possible that I could have overlooked something or made a mistake.

Weather

Season Warmer Than Usual Typical Colder Than Usual Wind* Precipitation* Severe Storm Rare
Spring 1-5 6-45 46-49 50-65 57-81 82-97 98-100
Summer 1-20 21-65 66-70 71-80 77-89 90-97 98-100
Fall 1-20 21-47 48-67 68-82 77-89 90-97 98-100
Winter 1-5 6-45 46-59 60-75 70-89 90-97 98-100

*Wind and Precipitation have overlapping results on purpose

Percentage Breakdown

Season Warmer Than Usual Typical Colder Than Usual Wind* Precipitation* Severe Storm Rare
Spring 5% 40% 5% 15% 35% 16% 3%
Summer 20% 45% 5% 10% 13% 8% 3%
Fall 20% 27% 20% 15% 13% 8% 3%
Winter 5% 40% 15% 16% 20% 8% 3%

Notes:

  • You could use the DMG p109 Wind & Precipitation tables for more complexity.
  • DMG p110 has rules for strong wind and heavy precipitation
  • Strong wind could also modify Fly speed, instead of preventing it, depending on the direction of the wind and flying (e.g. half speed for headwind and plus half speed for tailwind)
  • A d4 could be rolled for determining the direction

Tenday Forecast

  1. Roll once on the Weather table
  2. The first result equals the first day
  3. For each following day, roll a 1d4
  4. Results: 1=Column before, 2/4=Same weather as previous day, 3=Column after
  5. If the previous day was Warmer Than Usual and a 1 is rolled for the next day, choose Typical for that day.
  6. There can only be one Rare weather event per four tendays
  7. A Rare weather event must be followed by a Typical weather day
  8. If a Rare weather event has already occurred within the past 40 days, then choose Precipitation
  9. Reroll on the Weather table for the beginning of each tenday
  10. You can use this algorithm for a 5 day forecast if you want to add more randomness. Hell, you can roll from the table each time, if you want. This algorithm is just to help create a smoother transition of weather so it's not "hot > severe storm > cold > severe storm > etc."
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