181
AWCN10 CWTO 131817
WEATHER SUMMARY
FOR ONTARIO AND THE NATIONAL CAPITAL REGION
ISSUED BY ENVIRONMENT CANADA
AT 2:17 P.M. EDT WEDNESDAY 13 AUGUST 2025.
DISCUSSION.
ON TUESDAY, AUGUST 12, 2025, A HOT AND HUMID AIR MASS BLANKETED MUCH
OF SOUTHERN ONTARIO, LEADING TO A FEW DAILY TEMPERATURE RECORDS
BEING BROKEN. THIS HEAT WAS FOLLOWED BY THUNDERSTORMS IN THE
AFTERNOON THAT PRODUCED SIGNIFICANT RAINFALL AND ISOLATED DAMAGING
WIND GUSTS. THERE WERE REPORTS OF DOWNED TREES, LOCALIZED FLOODING,
AND POWER OUTAGES. SOME SMALL HAIL WAS ALSO REPORTED WITH
YESTERDAY'S STORMS.
THE FOLLOWING AREAS SET A DAILY MAXIMUM TEMPERATURE RECORD ON AUGUST
12, 2025 (TEMPERATURE VALUES GIVEN IN DEGREES CELSIUS):
ALGONQUIN PARK (LAKE OF TWO RIVERS) AREA
NEW RECORD OF 32.5
OLD RECORD OF 32.2 SET IN 1947
RECORDS IN THIS AREA HAVE BEEN KEPT SINCE 1917
BANCROFT AREA
NEW RECORD OF 34.8
OLD RECORD OF 33.0 SET IN 1988
RECORDS IN THIS AREA HAVE BEEN KEPT SINCE 1882
KAWARTHA LAKES (LINDSAY) AREA
NEW RECORD OF 33.7
OLD RECORD OF 33.3 SET IN 1947
RECORDS IN THIS AREA HAVE BEEN KEPT SINCE 1880
OTTAWA (RICHMOND - METCALFE) AREA
NEW RECORD OF 35.3
OLD RECORD OF 35.0 SET IN 1947
RECORDS IN THIS AREA HAVE BEEN KEPT SINCE 1938
PETAWAWA AREA
NEW RECORD OF 34.6
OLD RECORD OF 34.4 SET IN 1947
RECORDS IN THIS AREA HAVE BEEN KEPT SINCE 1915
NOTE: THE TEMPERATURE RECORDS REPORTED HERE HAVE BEEN DERIVED FROM A
SELECTION OF HISTORICAL STATIONS IN EACH GEOGRAPHIC AREA THAT WERE
ACTIVE DURING THE PERIOD OF RECORD.
THE FOLLOWING IS A SUMMARY OF RAINFALL AMOUNTS RECEIVED BY
ENVIRONMENT CANADA IN MILLIMETRES (MM):
*ILDERTON 113.0
*BELLE RIVER 84.1
*THAMESVILLE 79.5
*SARNIA 71.9
^STOUFFVILLE 53.4
*THORNDALE 46.5
*HAGERSVILLE 41.1
CEDAR SPRINGS 40.2
*DENOTES VOLUNTEER OBSERVATION VIA COCORAHS (COMMUNITY COLLABORATIVE
RAIN, HAIL AND SNOW) NETWORK
^DENOTES TORONTO & REGION CONSERVATION AUTHORITY OBSERVATION
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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