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DYO Weather Chart

  Temperate Arid Tropical
DR Mar, Apr, May Jun, Jul, Aug Sep, Oct, Nov Dec, Jan, Feb Apr May-Sep Oct, Nov Dec-Mar  
2MudOvercastFog/MistGustyMudClearMudClear & GustyHeavy Rain†‡& Mud
3MudClear & GustyClear & GustyOvercastClear & GustyClear & GustyClear & GustyClear & GustyHeavy Rain†£
4Clear & GustyFog/MistMudMud & OvercastClear & GustyClearClearClearMud & Overcast
5OvercastOvercastOvercastClear & GustyClearClearClearClearMud
6ClearClearClearSnowClearClearClearClear & GustyOvercast§
7Clear & GustyClearClearClearClear & GustyClearClearOvercastOvercast
8ClearClearClearClear & GustyClearClearClear & GustyOvercastClear & Gusty
9Fog/MistClearClear & GustySnowClearClear & GustyOvercastMudClear
10MudClear & GustyMudSnowOvercastClearOvercastMud & OvercastClear
11Mud & OvercastMudMud & OvercastSnowOvercastClearClearMud & OvercastClear
12Snow*Mud & OvercastSnow*SnowMud & OvercastOvercastMud & OvercastMud & OvercastClear
*Mar & Nov only, otherwise overcast
Heavy Rain throughout scenario
Streams, ponds, rivers are flooded, all river current is heavy
£All streams deep, river current moderate
§If rain starts then Heavy Rain throughout scenario

Environmental Conditions

dr Temperate Arid Tropical
<=0SnowMudMud
1MudMudMud
2WetWetWet
3MoistMoistWet
4ModerateModerateMoist
5DryDryMoist
6Very DryVery DryModerate
7  Moderate
>=8  Dry
drm:
 -3: Jan, Feb-1: Dec-Mar-2: Jun-Sep in Burma/India
-2: Mar, Dec+3: Apr-Sep+2: Nov-Apr in Burma/India
-1: Apr, Nov +3: 8-9/42, 2-8/44 with USMC
0: May, Oct  
+1: Jun, Sep  
+2: Jul, Aug  

Wind

drTemperateAridTropical
1NoneNoneMild
2NoneMildMild
3NoneMildMild
4MildMildHeavy
5MildMildNone
6HeavyHeavyNone

Time of Day

dr 
1Early Morning
2Mid Morning
3Midday
4Mid Afternoon
5Late Afternoon
6Night

Snow Chart

drCondition
0-1Falling snow
2Ground snow
3Ground snow & falling snow
4Deep snow
5Deep snow & falling snow
6Deep snow & drifts
7Extreme winter (make another dr, E3.74)
drm +1: Dec-Feb
-1: Mar, Nov

Night

final dr colored dr
Cloud Cover
white dr
Moon Phase
<= 2NoneFull
3,4ScatteredHalf
>=5OvercastNo Moon
NVR Modifier
 Moon Phase
Cloud CoverNo MoonHalfFull
None0+1+2
Scattered-10+1
Overcast-2-10

NVR Modifier is added to 3 (or 6 if Ground/Deep Snow) to determine base NVR

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