Difference between revisions of "Weather"

From Hearts of Iron 4 Wiki
Jump to navigation Jump to search
m (Precipitation)
(Temperature)
 
(15 intermediate revisions by 9 users not shown)
Line 1: Line 1:
{{version|Pre-release}}
+
{{version|1.3}}
{{expand|with=info on how the different stats are determined. Exact effects}}
 
 
{{see also|Terrain}}
 
{{see also|Terrain}}
 
A dynamic counterpart to [[terrain]], weather can affect movement and combat of all types of units.
 
A dynamic counterpart to [[terrain]], weather can affect movement and combat of all types of units.
  
 
== Night ==
 
== Night ==
 +
{{SVersion|1.3}}
 
Night gives the following effects:
 
Night gives the following effects:
  
Line 14: Line 14:
  
 
==Weather Types==
 
==Weather Types==
There are 6 types of basic weather in the game. These directly affect air and navies and land units indirectly
+
{{SVersion|1.3}}
===Clear skies===
+
Weather can have an impact on the whole state or on single provinces.
* Baseline weather with no modifiers.
+
===State Level===
 
 
===Rain===
 
* Harder to detect enemy air and navies.
 
* Airplane attacks against ships less effective as well as ship-to-ship accuracy.
 
* Higher risk of airplane accidents.​
 
 
 
===Storm===
 
[[File:Russian storm.jpeg|thumbnail|Storms are visually represented by heavy clouds and lightning effects.]]
 
* A much stronger version of Light Rain.
 
* Carrier planes won't be able to take off.
 
* Bombers will have a hard time hitting targets.
 
 
 
===Snow===
 
* Harder to detect enemy air and navies.
 
* Airplane attacks against ships less effective as well as ship-to-ship accuracy.
 
* Higher risk of airplane accidents.​
 
 
 
===Blizzard===
 
* A much stronger version of Snow.
 
* Carrier planes won't be able to take off.
 
* Bombers will have a hard time hitting targets.​
 
 
 
===Sandstorm===
 
* Almost impossible to detect other aircraft.
 
* Extremely high chance of airplane accidents.
 
* Bombers won’t be able to hit targets on ground.​
 
 
 
== Precipitation ==
 
{{SVersion|1.1}}
 
In addition to the immediate effects, precipitation can produce ground effects of mud or snow.
 
  
 
{|class = "wikitable sortable" style="text-align: right;"
 
{|class = "wikitable sortable" style="text-align: right;"
Line 122: Line 92:
 
|}
 
|}
  
== Temperature ==
+
Carrier Traffic -100% means that no planes from a carrier can fly.
 
+
===Province Level===
 +
==== Temperature ====
 +
{{SVersion|1.3}}
 
{|class = "wikitable sortable" style="text-align: right;"
 
{|class = "wikitable sortable" style="text-align: right;"
 
! Condition
 
! Condition
! Division attrition
+
! Division Attrition
! Winter attrition
+
! Winter Attrition
! Land attack
+
! Division Attack
 
! Organization Regain
 
! Organization Regain
 
! Entrenchment speed
 
! Entrenchment speed
 +
! Lower Bound in Degrees
 +
! Upper Bound in Degrees
 
|-
 
|-
 
| style="text-align: left;" | [[file:Extremely cold.png|x40px]]Extremely cold
 
| style="text-align: left;" | [[file:Extremely cold.png|x40px]]Extremely cold
Line 138: Line 112:
 
| {{red|−5%}}
 
| {{red|−5%}}
 
| {{red|−60%}}
 
| {{red|−60%}}
 +
| -100
 +
| -25
 
|-
 
|-
 
| style="text-align: left;" | [[file:Very cold.png|x40px]]Very cold
 
| style="text-align: left;" | [[file:Very cold.png|x40px]]Very cold
Line 145: Line 121:
 
|  
 
|  
 
| {{red|−30%}}
 
| {{red|−30%}}
 +
| -25
 +
| -15
 
|-
 
|-
 
| style="text-align: left;" | [[file:Very hot.png|x40px]]Very hot
 
| style="text-align: left;" | [[file:Very hot.png|x40px]]Very hot
Line 152: Line 130:
 
|  
 
|  
 
|  
 
|  
 +
| 27
 +
| 32
 
|-
 
|-
 
| style="text-align: left;" | [[file:Extremely hot.png|x40px]]Extremely hot
 
| style="text-align: left;" | [[file:Extremely hot.png|x40px]]Extremely hot
Line 159: Line 139:
 
| {{red|−5%}}
 
| {{red|−5%}}
 
|  
 
|  
 +
| 32
 +
| 100
 
|}
 
|}
 
Note: ''Attrition from weather only applies if controller is at war.''
 
Note: ''Attrition from weather only applies if controller is at war.''
  
== Ground effect ==
+
While winter attrition can be reduced by appointing the armies to a commander with a {{iconify|Winter Specialist}} trait, division attrition cannot be reduced. Commanders gain the {{iconify|Winter Specialist}} trait by fighting for a longer time in cold weather.
 +
 
 +
{{Expansion|tfv}}{{flag|South Africa}} has a unique focus [[South African national focus tree|Desert Equipment]] reducing heat attrition.
 +
 
 +
==== Ground conditions ====
 +
{{SVersion|1.3}}
 
{|class = "wikitable sortable" style="text-align: right;"
 
{|class = "wikitable sortable" style="text-align: right;"
 
! Condition  
 
! Condition  
 
! Attrition  
 
! Attrition  
! Land speed
+
! Divisions speed
! Land attack
+
! Division Attack
 
! Organization Regain
 
! Organization Regain
 
|-
 
|-
 
| style="text-align: left;" | Deep snow
 
| style="text-align: left;" | Deep snow
 
|  
 
|  
| {{red|−15%}}
+
| {{red|−25%}}
 
| {{red|−30%}}
 
| {{red|−30%}}
 
| {{red|−5%}}
 
| {{red|−5%}}
Line 185: Line 172:
 
| {{red|+70%}}
 
| {{red|+70%}}
 
| {{red|−50%}}
 
| {{red|−50%}}
| {{red|-40%}}
+
| {{red|−40%}}
 
|  
 
|  
 
|}
 
|}
  
==Temperature==
+
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.
Temperature is tracked on province level and mainly affects attrition levels. If its very cold or very warm things will tend to break down a lot more often. Each nation will want leaders with the Winter Specialist trait to maximize efficiency in cold weather.
 
  
Dig-in speed is slowed down a lot in extreme cold. There is no winter clothing research as such. To gain those winter specialist traits through fighting in cold weather.
+
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.
  
==Mud and Snow==
+
==Terrain Effects on Weather==
[[File:Russian mud.jpeg|thumbnail|A province affected by mud.]]
+
{{SVersion|1.3}}
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.
+
Some terrain makes it more or less likely for a weather effect to occur.
  
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.
+
{|class = "wikitable sortable" style="text-align: right;"
 +
! Weather
 +
! Mountain
 +
! Plains
 +
! Marsh
 +
! Desert
 +
! Urban
 +
|-
 +
| style="text-align: left;" | Mud
 +
| -10%
 +
| +50%
 +
| +80%
 +
| +50%
 +
|
 +
|-
 +
| style="text-align: left;" | [[file:Snow.png|x40px]] Snow and [[file:Blizzard.png|x40px]] Blizzard
 +
| +80%
 +
|
 +
|
 +
| -100%
 +
| -40%
 +
|-
 +
| style="text-align: left;" | [[file:Sandstorm.png|x40px]] Sandstorm
 +
| -100%
 +
|
 +
|
 +
| +80%
 +
|
 +
|}
  
 
==Shown on map==
 
==Shown on map==
 +
{{SVersion|1.3}}
 +
[[File:Russian mud.jpeg|thumbnail|A province affected by mud.]]
 
Snow/mud and such is shown directly on the map while storm clouds and rain is in a layer above which fades away the closer zoomed in the player is.
 
Snow/mud and such is shown directly on the map while storm clouds and rain is in a layer above which fades away the closer zoomed in the player is.
  
[[Category:Military]]
+
[[Category:Game concepts]]
  
 
[[hoi4de:Weather]]
 
[[hoi4de:Weather]]

Latest revision as of 03:39, 28 June 2019

See also: Terrain

A dynamic counterpart to terrain, weather can affect movement and combat of all types of units.

Night[edit]

Night gives the following effects:

  • -50% land attack
  • -20% air detection
  • -25% naval hit chance
  • Carrier aircraft cannot fly
  • -50% bombing targeting

Weather Types[edit]

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

State Level[edit]

Condition Organization Regain Naval Detection Naval Hit Chance Naval Speed Naval Strike Carrier Traffic Air Detection Air Accidents Chance Air Mission Efficiency Ground Bombing Targeting
Rain.pngRain −5% −10% −5% −5% −20% −10% +10% −10%
Storm.pngStorm −20% −20% −10% −10% −100% −20% +30% −30% −50%
Snow.pngSnow −5% −15% −5% −5% −30% −15% +10% −10%
Blizzard.pngBlizzard −30% −30% −10% −10% −100% −30% +30% −30% −70%
Sandstorm.pngSandstorm −50% −90% +60% −50% −100%

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

Province Level[edit]

Temperature[edit]

Condition Division Attrition Winter Attrition Division Attack Organization Regain Entrenchment speed Lower Bound in Degrees Upper Bound in Degrees
Extremely cold.pngExtremely cold +20% −10% −5% −60% -100 -25
Very cold.pngVery cold +10% −30% -25 -15
Very hot.pngVery hot +10% 27 32
Extremely hot.pngExtremely hot +20% −5% 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 SpecialistWinter Specialist trait, division attrition cannot be reduced. Commanders gain the Winter SpecialistWinter Specialist trait by fighting for a longer time in cold weather.

Flag of South Africa South Africa has a unique focus Desert Equipment reducing heat attrition.

Ground conditions[edit]

Condition Attrition Divisions speed Division Attack Organization Regain
Deep snow −25% −30% −5%
Snow −10% −10%
Mud +70% −50% −40%

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[edit]

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.png Snow and Blizzard.png Blizzard +80% -100% -40%
Sandstorm.png Sandstorm -100% +80%

Shown on map[edit]

A province affected by mud.

Snow/mud and such is shown directly on the map while storm clouds and rain is in a layer above which fades away the closer zoomed in the player is.