I was tweaking my Morrowind.ini file and noticed that the settings for Snow and Blizzard were missing. This might have happened after Galaxy updated Morrowind. If this happens to anyone else, here are the defaults for these sections that I had from an old install:

[Weather Snow]
Sky Sunrise Color=106,091,091
Sky Day Color=153,158,166
Sky Sunset Color=096,115,134
Sky Night Color=031,035,039
Fog Sunrise Color=106,091,091
Fog Day Color=153,158,166
Fog Sunset Color=096,115,134
Fog Night Color=031,035,039
Ambient Sunrise Color=092,084,084
Ambient Day Color=093,096,105
Ambient Sunset Color=070,079,087
Ambient Night Color=049,058,068
Sun Sunrise Color=141,109,109
Sun Day Color=163,169,183
Sun Sunset Color=101,121,141
Sun Night Color=055,066,077
Sun Disc Sunset Color=128,128,128
Transition Delta=.015
Land Fog Day Depth=1.0
Land Fog Night Depth=1.2
Clouds Maximum Percent=1.0
Wind Speed=0
Cloud Speed=1.5
Glare View=0
Cloud Texture=Tx_BM_Sky_Snow.tga
Ambient Loop Sound ID=None
Snow Threshold=0.5
Snow Diameter=800
Snow Height Min=400
Snow Height Max=700
Snow Entrance Speed=6
Max Snowflakes=750

[Weather Blizzard]
Sky Sunrise Color=091,099,106
Sky Day Color=121,133,145
Sky Sunset Color=108,115,121
Sky Night Color=027,029,031
Fog Sunrise Color=091,099,106
Fog Day Color=121,133,145
Fog Sunset Color=108,115,121
Fog Night Color=021,024,028
Ambient Sunrise Color=084,088,092
Ambient Day Color=093,096,105
Ambient Sunset Color=083,077,075
Ambient Night Color=053,062,070
Sun Sunrise Color=114,128,146
Sun Day Color=163,169,183
Sun Sunset Color=106,114,136
Sun Night Color=057,066,074
Sun Disc Sunset Color=128,128,128
Transition Delta=.030
Land Fog Day Depth=2.8
Land Fog Night Depth=3.0
Clouds Maximum Percent=1.0
Wind Speed=.9
Cloud Speed=7.5
Glare View=0
Cloud Texture=Tx_BM_Sky_Blizzard.tga
Ambient Loop Sound ID=BM Blizzard
Storm Threshold=.50