Current weather conditions will be directly related to the region's climate. Data from specific campaigns will also be used as a reference. Also players with the necessary data on adverse weather during a specific battle may want to use that information.

Due to the short amount of actual time represented during a miniatures battle, weather at the skirmish level would rarely change during the course of the scenario. Unless conditions reflect a prior weather event, such as mud or snow, there is no chance for clear weather to become adverse. If the ground contains snow or mud, then there would be a chance for rain or snow to start even if the initial turn is clear. If the initial turn contains precipitation, then there would be a chance for the weather to worsen or slacken.

In regards to the affect of adverse weather, mainly two areas would be influenced. These are visibility and movement. Precipitation would greatly reduce actual visibility especially at night. Movement would be reduced because of the obvious difficulties caused by mud or snow. Vehicles and wagons are more likely to get stuck or breakdown. The strain on men and horses would greatly fatigue them, if they did not slow their pace. In addition all movement should be regarded as hazardous if undetected. The argument is that it is impossible to maintain stealth under such conditions. A counter argument states that the rain's noise would cover much of the extra noise caused by movement.

Also the rain would reduce the alertness of the listener, especially ay night. Therefore movement may or may not be harder to detect depending on which argument you support. As the designer, I tend to regard a run/walk normally but increase the noise hazard for any other activity such as climbing. Other areas of interest is that adverse weather may cause fatigue , weaken morale or cause primitive firearms not to work.

Initial Weather Chart

Reference the region with the die roll (d10). The season may or may not be considered.

Area	1	2	3	4	5	6	7	8	9	0
China	C	D	B	B	D	B	A	E	C	A
India	A	C	F	A	E	B	A	F	D	A
Western USA	B	A	F	A	B	D	C	D	A	E
Eastern USA	D	B	A	D	C	F	B	A	E	A
Med Europe	A	A	A	B	C	F	F	A	B	F
North Africa	F	B	A	C	A	F	A	A	B	D
South Africa	C	A	A	B	D	A	B	F	A	E
Tropical Areas	C	F	A	B	A	A	A	F	C	B

For South America other than in tropical areas use Eastern USA.
For Florida (East USA) use the Tropical Chart
For Europe use the Eastern USA column
For Mexico, Turkey and Egypt use the Med Europe column

Seasonal Weather

Season/Area	1	2	3	4	5	6	7	8	9	0
Winter/Cold climates	A	A	B	C	D	D	D	E	E	A
Winter/Moderate climates	A	A	A	B	B	C	D	D	E	E
Summer/Moderate climates	A	A	A	B	B	C	C	A	F	A
Summer-Dry/Hot climates	A	A	A	A	B	C	F	F	F	F
Monsoon Season	A	A	F	B	B	C	C	C	B	F
For deserts B and C results are read as A.

Weather code definitions

A. Clear : No effect
B. Showers : Visibility reduced to 75% allowed range
C. Rain : All streams and rivers cannot be forded or swam. Off-road movement is halved. Road movement is reduced to a 75% rate. Visibility is reduced to half range. Vehicles are subject to breakdown when off-road. Movement may cause fatigue.
D. Flurries : Visibility is reduced to half range.
E. Snow : Visibility is reduced to half or even only 25% range. All foot and mounted movement is reduced to half speed. Vehicles move at half speed and are subject to breakdown. Movement may cause fatigue.
F. Hot : All foot and mounted movement is reduced to a 75% rate. Movement causes fatigue.

Changes in Current Weather

Hot cannot change. Clear can only change if the ground is already muddy or has snow.

Current Weather	Die Roll (d10/d6) = New Weather
Clear	0-1/1 = Flurries or Showers
Showers	0-1-2/1-2 = Clear; 3-4-5-6/3-4 = Showers; 7-8-9/5-6= Rain
Rain	0-1-2/1-2= Clear; 3-4-5/3-4 = Showers; 6-7-8-9/5-6= Rain
Flurries	0-1-2-3/1-2= Clear; 4-5-6-7/3-4-5 = Flurries; 8-9/6 = Snow
Snow	0-1-2-3/1-2= Clear; 4-5-6/3-4 = Flurries; 7-8-9/5-6= Snow
Extreme weather option. If raining or snowing a d9 roll will result in a deluge or blizzard which will halt all voluntary movement toward the enemy.