In internal views there is no snow.
FG 3.4 RC1
Basic weather with Live metar
Windows 7 64bit, geforce 520m
Plane 777-300ER and others
d:\ProgramFiles\FlightGear34rc1\bin\fgfs.exe
--fg-root=d:\ProgramFiles\FlightGear34rc1\data
--fg-scenery=C:\Users\Nikolai\Documents\FlightGear\Custom Scenery;d:\ProgramFiles\FlightGear34rc1\data\Scenery;d:/ProgramFiles/terrasync
--terrasync-dir=d:\programfiles\terrasync
--fg-aircraft=C:\Users\Nikolai\Documents\FlightGear\Aircraft;d:/ProgramFiles/Development/Git/flightgear-saab-ja-37-viggen/Aircraft
--airport=EKCH
--runway=04L
--aircraft=777-300ER
--language=en
--console
--disable-random-objects
--prop:/sim/rendering/random-vegetation=false
--enable-horizon-effect
--enable-enhanced-lighting
--enable-ai-models
--enable-ai-traffic
--enable-real-weather-fetch
--geometry=1366x768
--bpp=32
--texture-filtering=4
--prop:/sim/rendering/multi-sample-buffers=1
--prop:/sim/rendering/multi-samples=4
--timeofday=noon
--enable-terrasync
--httpd=8080
--disable-fgcom
--prop:/sim/rendering/max-paged-lod=8
--prop:/sim/tile-cache/enable=false
--prop:/sim/rendering/multithreading-mode=AutomaticSelection
--prop:/sim/sound/voices/enabled=0