the Dasht-e Lut has the hottest recorded surface temp on earth, measured by nasa to be 70.7°C or 159.3°F.
"the site of the most snowfall on earth"
very broad term. site of the highest annual recorded snowfall is actually mt baker in 98-99 with 1140inches.
but saying "the site with the most snowfall on earth" would generally be accepted as the highest average snowfall, which would be 694 in, measured in Sukayu Onsen, Japan.
the fastest surface wind speed ever recorded was actually in australia. 408km/h. 253mph
Wind speeds within certain atmospheric phenomena (such as tornadoes) may greatly exceed these values but have never been accurately measured
From the World Meteorological Organisation - for anyone who cant click the link
"Geneva, 22 January 2010 (WMO) - According to a recent review conducted by a panel of experts in charge of global weather and climate extremes within the WMO Commission for Climatology (CCl) the record of wind gusts not related to tornados registered to date is 408 km/h during Tropical Cyclone Olivia on 10 April 1996 at Barrow Island, Australia. The previous record was of 372 km/h, registered in April 1934 across the summit of Mount Washington, USA.
The Panel consisted of the following experts: Dr Pierre Bessemoulin, MeteoFrance and President of CCl; Dr Tom Peterson, NOAA National Climatic Data Center; Dr Blair Trewin, Australian Bureau of Meteorology; Dr Jose M. Rubiera Torres, Cuban Instituto de Meteorología; Dr John (Jack) Beven, USA National Hurricane Center; Dr John King, British Antarctic Survey; Dr Randy Cerveny, Arizona State University and CCl Rapporteur of Climate Extremes.
The panel came to its conclusion after an extensive review and evaluation of instrumental, phenomenological and statistical data."