439
AWCN10 CWTO 292330
WEATHER SUMMARY
FOR ONTARIO AND THE NATIONAL CAPITAL REGION
ISSUED BY ENVIRONMENT CANADA
AT 6:30 P.M. EST MONDAY 29 DECEMBER 2025.
DISCUSSION.
A VERY STRONG LOW PRESSURE SYSTEM SWEPT ACROSS ONTARIO FROM DECEMBER
28TH TO DECEMBER 29TH. THIS SYSTEM BROUGHT SIGNIFICANT FREEZING
RAIN, RAIN, AND WIND TO SOUTHERN ONTARIO, WHILE NORTHEASTERN ONTARIO
SAW SIGNIFICANT SNOWFALL WITH BLIZZARD-LIKE CONDITIONS. THERE WERE
NUMEROUS POWER OUTAGES AND ROAD CLOSURES REPORTED WITH THE FREEZING
RAIN. LAKE EFFECT SNOW SQUALLS HAVE DEVELOPED IN THE WAKE OF THE
SYSTEM, WITH HEAVY SNOW AND BLIZZARD-LIKE CONDITIONS OCCURRING FOR
AREAS SOUTHEAST OF LAKE HURON AND GEORGIAN BAY. THIS EVENT IS STILL
ONGOING AND THIS SUMMARY MAY BE UPDATED AS MORE INFORMATION BECOMES
AVAILABLE.
THE FOLLOWING IS A SUMMARY OF WEATHER EVENT INFORMATION RECEIVED BY
ENVIRONMENT CANADA AS OF 5:00 P.M EST MONDAY DECEMBER 29TH, 2025.
1. SUMMARY OF TOTAL RAINFALL AMOUNTS IN MILLIMETRES:
FULLARTON 61.7*
WATERLOO 55.9*
BRUSSELS 55.3*
MITCHELL 50.8*
GUELPH 48.3
ST. CATHARINES AIRPORT 43.5
MISSISSAUGA 43.2*
KITCHENER AIRPORT 43.2
SARNIA AIRPORT 41.1
OAKVILLE 38.1*
*DENOTES VOLUNTEER OBSERVATIONS THROUGH THE COCORAHS NETWORK
2. SUMMARY OF TOTAL FREEZING RAIN ACCRETION (IN MILLIMETRES):
LONDON AREA 12*
OTTAWA 8*
KITCHENER 5*
MILLBROOK 5*
*DENOTES SOCIAL MEDIA REPORTS
3. SUMMARY OF TOTAL SNOWFALL AMOUNTS IN CENTIMETRES:
SAULT STE. MARIE 17*
TIMMINS AIRPORT 17^
LAKE SUPERIOR PROVINCIAL PARK 26^
KAPUSKASING 16
SAULT STE. MARIE AIRPORT 13
KIRKLAND LAKE 13^
WAWA 11
*DENOTES VOLUNTEER OBSERVATIONS THROUGH THE COCORAHS NETWORK
^DENOTES ESTIMATION FROM SNOW DEPTH CHANGE
4. SUMMARY OF MAXIMUM WIND GUSTS IN KM/H:
POINT PETRE 106
COBOURG 96
TORONTO ISLAND AIRPORT 93
ST. CATHARINES AIRPORT 91
CHATHAM AIRPORT 89
WESTERN ISLAND 89
WELCOME ISLAND 87
WASAGA BEACH 87
PORT WELLER 83
TRENTON AIRPORT 83
HAMILTON AIRPORT 83
TORONTO PEARSON 78
PLEASE NOTE THAT THIS SUMMARY MAY CONTAIN PRELIMINARY OR UNOFFICIAL
INFORMATION AND DOES NOT CONSTITUTE A COMPLETE OR FINAL REPORT.
END/OSPC
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