SXUS75 KRIW 060732 RERGEY RECORD EVENT REPORT NATIONAL WEATHER SERVICE RIVERTON WY 0129 AM MDT SUN APR 06 2025 ...RECORD LOW TEMPERATURE SET AT GREYBULL WY... A RECORD LOW TEMPERATURE OF 17 DEGREES WAS SET AT GREYBULL WY YESTERDAY, APRIL 5TH, 2025. THIS BREAKS THE OLD RECORD OF 18 DEGREES SET IN 1999. $$