While at work I realized my campaign doesn’t really have an interesting weather system. Most of the days are nothing noteworthy and aren’t particularly interesting. But, now in my campaign were are entering into late autumn/early winter so I decided to create my own weather system! It includes the four seasons and is intended for temperate climates.
I am by no means an expert on weather, this is all pretty basic and just for fun. You can use this table and modify as you see fit.
(Click Keep Reading below the image for more specific information and a text version of the chart at the bottom)
Weather Effects (1d100)
 1-60 Regular Weather
61-90 Stormy Weather
91-100 Unusual Weather
+Optional Weather Features
 Regular Weather
-Seasonal (1d20)
-Cloud Coverage (1d8)
-Wind Speed (1d100)
 Spring Weather (1d20)
1 Chilly
2-6 Cool
7-12 Temperate
13-17 Warm
18-19 Mild Heat
20 Hot
 Summer Weather (1d20)
1-2 Cool
3-6 Temperate
7-9 Warm
10-13 Mild Heat
14-17 Hot
18-20 Blistering
 Autumn Weather (1d20)
1-4 Cold
5-8 Chilly
9-13 Cool
14-17 Temperate
18-19 Warm
20 Mild Heat
 Winter Weather (1d20)
1-4 Below Freezing
5-10 Freezing
11-15 Cold
16-17 Chilly
18-19 Cool
20 Temperate
 Cloud Coverage (1d8)
1 Clear
2 Fair
3 Mostly Sunny
4 Partly Cloudy
5 Mostly Cloudy
6 Broken
7 Overcast
8 Reroll, ignoring results of 8
 Wind Speed (1d100)
1-20 Calm
21-40 Light Breeze
41-60 Moderate Breeze
61-70 Strong Breeze
71-80 Gale
81-90 Strong Gale
91-95 Storm Winds
96-100 Violent Storm Winds
 Stormy Weather
-Rain/Snow (1d100)
-Additional Effects if you roll a 61 or higher on the Rain chart (1d20)
 Rain (1d100)
1-10 Cloudy, Chance of Rain
11-30 Light Sprinkling
31-50 Drizzle
51-60 Irregular Showers
61-80 Raining
81-90 Heavy Rain
91-100 Rainstorm
 Additional Effects (1d20)
1 Roll Twice
2-8 No Effect
9-12 Lightning
13-15 Thunder & Lightning
16-18 Light Hail
19-20 Heavy Hail
 Snow (1d100)
1-10 Cloudy, Chance of Snow
11-30 Light Flurry
31-50 Slow Snowfall
51-60 Irregular Snowfall
61-80 Snowing
81-90 Snowstorm
91-100 Blizzard
  Unusual Weather (1d20)
1 Raining Frogs
2 Raining Diamond Dust
3 Meteor Shower
4 Twister
5 Tornado
6 Sharknado
7 Fire Tornado
8 Hurricane
9 Dust Storm
10 Swarm of Locusts
11 Swarm of Birds
12 Drought
13 Flooding
14 Flash Flood
15 Eclipse
16 Off Season Weather
17 Strangely Colored Sky
18 Strange Lights
19 Magic Storm
20 UFO
 Optional Weather Features
-Humidity/Dryness (1d12)
-Fog (1d12)
 Humidity/Dryness (1d12)
1 Dry
2-3 Moderately Dry
4-9 Comfortable Balance
10-11 Moderately Humid
12 Humid
 Fog (1d12)
1-6 Clear, No Fog
7-9 Light Fog
10-11 Foggy
12 Heavy Fog
How to Use this Table: Simply all you need to do is roll a 1d100 to determine what kind of weather will occur on that day and then roll the rest of the tables that follow. You can ignore, add, or change rolls if the given details do not fit together or if you want more specific details. (For example, the Unusual Weather only specifies one pattern of weather. So you could also roll Regular Weather to inspire/fill in the rest of the details)
Weather Duration: Sometimes weather remains fairly consistent over the course of a few days, going from a rainstorm to a bright sunny day back to a rainstorm might feel strange or out of place. (Although weather can be pretty strange) Simply rolling a 1d6 or 1d8 to determine how many days the weather will last can help keep things a little more realistic.
Gradual Weather Change: Along with Weather Duration, you can also change a few details of the weather from day to day (if it’s supposed to last a while) by using the option (or two) above or below the current weather rolled. (For example a Hot day with a Strong Breeze could change to a Mild Heat with a Moderate Breeze followed by a Hot day without wind)
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