天气

参见：Terrain

A dynamic counterpart to terrain, weather can affect movement and combat of all types of units. It should be noted provinces do not always have weather, and some provinces have no temperature modifers.

Night

Night gives the following effects:

• -50% land attack
• -20% air detection
• -25% naval hit chance
• Carrier aircraft cannot fly
• -50% bombing targeting
• +10% naval retreat speed
• -90% close air support damage

Weather types

Weather can have an impact on the whole state or on single provinces.

State level

Condition	Organization Regain	Positioning	Naval Detection	Naval Hit Chance	Naval Speed	Naval Retreat Speed	Naval Strike	Carrier Traffic	Air Detection	Air Accidents Chance	Air Mission Efficiency	Ground Bombing Targeting
Rain	−5%	–	−10%	−5%	−5%	+5%	−20%	–	−10%	+10%	−10%	–
Storm	−20%	−10%	−20%	−20%	−10%	+10%	-40%	−80%	−20%	+30%	−30%	−50%
Snow	−5%	-10%	−15%	−5%	−5%	+5%	−30%	–	−15%	+10%	−10%	–
Blizzard	−30%	-20%	−30%	−10%	−10%	+15%	-40%	−100%	−30%	+30%	−30%	−70%
Sandstorm	−50%	–	–	–	–	–	-90%	–	−90%	+60%	−50%	−100%

Carrier Traffic -100% means that no planes from a carrier can fly.

Province level

Temperature

Condition	Heat Attrition	Winter Attrition	Division Attack	Organization Regain	Entrenchment speed	Division speed	Fleet speed while retreating	Supply consumption	Lower Bound in Degrees	Upper Bound in Degrees
Extremely cold		+20%	−50%	−10%	−60%	-25%	+10%		-100	-25
Very cold		+10%	-40%	-5%	−30%	-25%	+10%		-25	-15
Very hot	+10%			-5%					27	32
Extremely hot	+20%		-10%	−10%				+50%	32	100

Note: Attrition from weather only applies if controller is at war.

While winter attrition can be reduced by appointing the armies to a commander with a  Winter Specialist trait, there is no corresponding trait to reduce heat attrition. Commanders gain the  Winter Specialist trait by fighting for a longer time in cold weather.

南非 has a unique focus Desert Equipment reducing heat attrition.

Ground conditions

Condition	Attrition	Divisions speed	Division Attack	Division Defence	Dig in Speed	Organization Regain	Naval Retreat Speed
Deep snow		−25%	−30%			−5%	+10%
Snow		−10%	−10%
Mud	+70%	−50%	−40%
Flooding		-50%		+50%	+20%

Very high snow will affect unit movement speed, but Mud is going to increase attrition levels a lot as well as slow the army down to a crawl. A smart player will try not to attack The Soviet Union just as mud season begins or they might find a lot of their panzer divisions bogged down.

If the area is set up as susceptible to mud that time of year and water levels over a time period is high enough mud develops. Either rain or melting snow can be the source of the water. The game logs how much rain has gone down in a special region. If the temperature is above 0, some of the stored water evaporates, the higher the temperature is, the higher the evaporation rate. If there is snow and the temperature is above 0, some snow will turn into water, the higher the temperature, the faster this conversion is. If there is mud (meaning there is a lot of water on the ground) and the temperature goes below 0, the mud disappears, because the water has frozen.

Terrain effects on weather

Some terrain makes it more or less likely for a weather effect to occur.

Weather	Mountain	Plains	Marsh	Desert	Urban
Mud	-10%	+50%	+80%	+50%
Snow and Blizzard	+80%			-100%	-40%
Sandstorm	-100%			+80%

机制 

事件与决议

事件 • 决议