Ontario Climate Change Extreme Rainfall Trends

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The following table presents short term rainfall trends for climate stations in Ontario. The significance of trends is shown as well as the trend direction - only a few percentage of stations have a significant trend that cannot be explained by random, minor variations. 'Decreasing' means less severe annual maximum rainfall amounts over the duration. 'Increasing' means more severe rainfall, or higher rainfall totals over the duration.

Trends are from Environment Canada's Engineering Climate Dataset v2.3 (idf_v2-3_2014_12_21_trends.txt, in IDF_Additional_Additionnel_v2.30.zip, downloaded through ftp://ftp.tor.ec.gc.ca/Pub/Engineering_Climate_Dataset/IDF/).


Ontario Extreme Rainfall Trends

Climate Station Name
Pr.
Extreme Rainfall Trend

Decreasing / Significant

Decreasing / Not Significant

No Data

Increasing / Not Significant

Increasing / Significant
5 min
     10 min
             15 min
                30 min
1 hr
          2 hr
6  hr
                12 hr
24 hr
Big Trout Lake
ON  
4
4
5
4
4
4
2
4
2
Ear Falls (Aut)
ON  
4
4
4
4
2
2
4
4
4
Lansdowne House (Aut)
ON  
4
4
4
2
2
2
2
2
2
Pickle Lake (Aut)
ON  
4
4
4
4
4
4
4
2
2
Red Lake A
ON  
4
4
4
4
5
5
4
4
4
Atikokan (Aut)
ON  
2
2
2
2
2
2
2
4
2
Kenora A
ON  
4
4
4
4
4
4
4
4
4
Rawson Lake (Aut)
ON  
5
4
4
4
4
4
4
4
4
Sioux Lookout A
ON  
2
2
2
4
4
4
4
2
2
Armstrong (Aut)
ON  
4
4
4
4
4
2
2
2
2
Caribou Island
ON  
4
2
2
4
4
4
4
4
4
Geraldton A
ON  
4
4
4
4
4
4
4
4
4
Pukaskwa Natl Park
ON  
2
2
2
2
2
2
2
4
4
Slate Island
ON  
5
5
5
5
4
4
4
4
4
Thunder Bay Cs
ON  
4
4
4
5
4
4
4
4
4
Elliot Lake A
ON  
4
4
4
4
4
5
4
2
4
Mississagi Ont Hydro
ON  
4
4
4
4
4
4
4
5
4
Rayner
ON  
2
4
2
4
4
4
2
4
4
Sault Ste Marie A
ON  
4
4
4
5
4
4
2
2
2
White River
ON  
4
4
4
4
4
5
4
4
4
Wawa (Aut)
ON  
2
2
2
2
2
2
4
4
4
Chapleau A
ON  
4
4
4
4
4
4
4
4
4
Sudbury A
ON  
2
2
4
4
4
2
2
2
2
Sudbury Science North
ON  
3
3
2
2
2
2
4
4
2
Dymond Ont Hydro
ON  
5
4
4
5
5
5
5
4
4
Kapuskasing Cda On
ON  
4
2
2
2
2
1
2
2
2
Kirkland Lake Cs
ON  
4
4
4
5
5
5
5
5
4
Moosonee Rcs
ON  
4
4
4
4
4
4
4
2
2
Pinard
ON  
4
4
4
4
4
4
4
4
2
Timmins Victor Power A
ON  
4
4
4
4
4
4
2
2
2
Upper Notch
ON  
2
2
2
2
2
2
1
2
2
La Cave
ON  
3
4
3
5
4
4
3
3
4
Lake Traverse
ON  
4
4
2
4
2
2
2
2
2
North Bay A
ON  
2
2
2
2
2
2
4
4
4
Great Duck Island
ON  
2
4
4
5
5
4
4
2
2
Bark Lake Dam
ON  
4
5
4
5
4
4
4
4
4
Brockville Pcc
ON  
4
2
2
2
2
2
4
4
4
Combermere
ON  
4
5
4
4
4
4
4
4
4
Cornwall
ON  
4
4
4
4
4
5
5
5
5
Cornwall Ont Hydro
ON  
2
2
2
2
2
2
2
4
4
Kemptville Cs
ON  
2
2
2
2
2
4
4
4
4
Kingston A
ON  
2
2
2
2
2
2
2
2
2
Kingston Pumping Station
ON  
4
4
2
2
2
2
2
2
2
Ottawa Cda Rcs
ON  
2
2
2
2
2
2
4
4
5
Ottawa Macdonald-Cartier Int'L A
ON  
2
1
1
2
1
2
2
4
4
Petawawa Nat Forestry
ON  
4
4
4
4
4
4
4
4
4
Smiths Falls Ts
ON  
2
2
2
2
4
4
5
4
5
Barrie Wpcc
ON  
2
2
2
4
4
4
4
4
4
Beausoleil
ON  
5
5
5
5
4
4
5
5
5
Collingwood
ON  
2
2
2
2
2
4
4
4
4
Dorset Moe
ON  
2
2
2
4
2
2
4
4
4
Orillia Brain
ON  
5
5
5
5
4
5
4
4
4
Owen Sound Moe
ON  
2
2
2
2
2
2
4
2
4
Ragged Rapids
ON  
1
2
2
2
2
2
2
2
2
Utterson Ont Hydro
ON  
3
3
3
3
2
2
2
4
5
Wiarton A
ON  
4
4
4
4
2
2
2
2
2
Egbert Cs
ON  
2
4
2
4
4
4
2
2
2
Cove Island
ON  
4
4
4
4
4
2
2
4
4
Goderich
ON  
4
4
4
2
4
2
2
2
2
Sarnia Airport
ON  
2
2
2
4
4
4
4
4
4
Cyprus Lake Cs
ON  
4
5
5
5
5
5
5
5
5
Chatham Wpcp
ON  
4
4
4
4
4
4
2
2
2
Delhi Cs
ON  
2
4
4
4
4
4
2
2
2
Harrow Cda Auto
ON  
2
4
2
2
2
2
2
2
2
Long Point
ON  
4
4
4
4
4
4
4
4
4
Niagara Falls
ON  
2
2
2
2
2
4
4
4
4
Port Colborne
ON  
4
2
2
2
2
2
4
5
5
Ridgetown Rcs
ON  
2
4
4
4
4
2
4
4
2
St Catharines A
ON  
2
2
2
2
2
1
2
4
4
St Thomas Wpcp
ON  
4
2
2
2
4
2
4
4
4
Simcoe
ON  
2
2
2
4
2
2
2
2
1
Vineland Station Rcs
ON  
4
4
4
4
4
2
4
4
4
Windsor A
ON  
2
1
2
2
2
1
1
1
2
Windsor University
ON  
4
4
4
4
4
4
2
2
2
Point Pelee Cs
ON  
4
4
4
4
4
4
4
4
4
Blue Springs Creek
ON  
2
2
2
2
2
2
2
2
4
Brantford Moe
ON  
2
2
2
4
4
4
4
2
4
Cambridge Galt Moe
ON  
4
4
4
4
4
4
2
4
2
Fergus Shand Dam
ON  
2
4
4
4
4
4
2
2
2
Glen Allan
ON   
3
3
3
3
4
4
4
4
4
Grand Valley Wpcp
ON  
2
2
4
2
4
4
4
4
4
Guelph Turfgrass Cs
ON  
4
4
4
4
4
4
2
2
2
Guelph Smallfield Farm
ON  
3
4
4
4
4
4
2
2
2
Kitchener City Eng 2
ON  
3
3
3
3
2
4
4
4
4
London Cs
ON  
4
4
4
4
2
2
2
2
2
Mount Forest (Aut)
ON  
2
4
4
4
4
4
4
4
2
Preston Wpcp
ON  
4
4
4
5
4
4
2
4
2
Prospect Hill
ON  
3
3
3
3
4
4
3
5
4
Stratford Wwtp
ON  
2
2
4
4
4
2
2
2
2
Waterloo Wellington A
ON  
2
4
4
4
4
2
4
2
2
Woodstock
ON  
2
2
2
2
2
2
2
2
2
Elora Rcs
ON  
2
2
2
4
2
2
2
2
1
Belleville
ON  
4
4
5
4
4
4
4
4
4
Bowmanville Mostert
ON  
4
4
4
4
4
4
4
4
4
Burketon Mclaughlin
ON  
4
2
2
4
4
4
4
5
5
Burlington Fire Hq'S
ON  
3
3
3
3
2
2
4
4
4
Campbellford
ON  
4
4
4
2
2
2
2
2
4
Greenwood Mtrca
ON  
4
4
4
4
4
4
4
4
4
Hamilton A
ON  
2
2
2
2
2
2
2
2
2
Hamilton Rbg Cs
ON  
4
4
4
2
2
2
2
2
2
Heart Lake
ON  
3
3
3
3
3
4
2
2
2
Main Duck Island
ON  
2
2
2
2
2
2
2
2
2
Maple
ON  
3
3
3
3
4
2
4
4
2
Milton Kelso
ON  
3
3
3
3
4
2
4
4
4
Oak Ridges
ON  
2
2
2
2
2
2
2
4
2
Orangeville Moe
ON  
2
2
2
4
3
3
2
3
3
Oshawa Wpcp
ON  
4
4
4
4
4
4
5
4
5
Picton
ON  
2
4
4
4
4
4
2
2
2
Smithfield Cda
ON  
3
3
3
3
2
2
2
2
2
Stouffville Wpcp
ON  
3
3
3
3
4
4
4
2
2
Toronto City
ON  
2
2
2
2
2
2
1
1
1
Toronto Booth
ON  
2
2
2
4
4
2
4
4
2
Toronto Ellesmere
ON  
4
4
4
4
2
2
2
2
2
Toronto Etobicoke
ON  
2
4
4
4
4
4
2
2
4
Toronto Greenwood
ON  
4
4
4
4
4
4
4
4
2
Toronto Island A
ON  
1
1
1
2
2
2
2
2
2
Toronto North York
ON  
4
4
4
4
4
4
4
4
4
Toronto Leslie Eglinton
ON  
4
4
2
2
4
2
4
4
2
Toronto Intl A
ON  
2
4
4
4
4
4
2
2
2
Toronto Met Res Stn
ON  
4
4
4
4
4
4
4
2
2
Toronto Old Weston Rd
ON  
2
4
4
4
4
4
2
2
2
Toronto Seneca Hill
ON  
2
4
2
4
2
4
4
4
4
Trenton A
ON  
2
2
2
2
4
4
4
4
4
Tweed
ON  
3
3
3
3
2
4
2
4
2
Wilcox Lake
ON  
3
3
3
3
4
3
4
3
3
Toronto York Mills
ON  
4
4
4
4
4
4
4
4
4
Toronto Buttonville A
ON  
2
2
4
2
2
2
2
2
2
Oakville Southeast Wpcp
ON  
4
4
4
4
4
4
4
4
4
Haliburton 3
ON  
4
4
4
4
4
4
4
4
4
Lindsay Filtration Plant
ON   
2
4
4
4
4
4
2
2
2
Peterborough A
ON  
4
2
2
2
4
4
4
4
4
Peterborough Stp
ON  
4
4
2
2
2
2
2
2
2
West Guilford
ON  
4
4
2
2
2
2
2
2
2

Extreme rainfall trends in Canada (Environment Canada Engineering Climate Datasets):

Static Maps: http://www.cityfloodmap.com/2015/12/severe-storm-trends-canada-rainfall.html

Interactive Map: http://www.cityfloodmap.com/2015/12/canadian-extreme-rainfall-map-climate.html

Table Summaries: http://www.cityfloodmap.com/2015/12/canadian-extreme-rainfall-summary-by.html

Chart and Table: http://www.cityfloodmap.com/2015/12/top-weather-story-in-canada-2015-less.html

 Long-term Station Table: http://www.cityfloodmap.com/2015/12/long-term-climate-change-short-term.html

Environment Canada Denies Changes: http://www.cityfloodmap.com/2015/10/bogus-statements-on-storms-in-cbcnewsca.html

Contradicting Insurance Industry Claims: http://www.cityfloodmap.com/2015/12/trends-in-canadian-shortduration.html
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