 borealforest org - northwestern ontario climat file localhost d itu web 20mine project uw-can-data webdata winter-canada menu map northwestern ontario climat northwestern ontario cover huge area superimpos europ extend pari munich south scotland denmark north it encompass countri includ denmark holland belgium luxembourg germani austria given vast area surpris weather extrem climat locat centr north america region continent climat warm hot summer cold winter spring autumn tend short season sandwich weather winter summer lake superior moder temperatur extrem larg lake region add winter snowfal subtract summer rain local basi temperatur the annual temperatur averag temperatur year vari 2 3 degre celsiu south -4c north sever locat share record maximum temperatur ontario 42 2c atikokan fort franc biscotas northeastern ontario mani station south record time maximum 40c occasion dai 35 uncommon at thermomet place central patricia hornepayn white river geraldton time minimum lower -50c white river spite claim coldest place canada honour belong snag yukon coldest ontario - iroquoi fall -58 3c record precipit precipit highli variabl year year locat locat as gener precipit increas move northwest southeast for exampl averag 600 millimetr mm precipit fall year big trout lake area to southeast total 900 mm marathon white river area in thunder bai annual averag 700 mm the bulk yearli total occur summer month - mai septemb - shower thunderstorm the grow season month period extend drought uncommon the winter 1995-96 broke period declin winter snowfal amount peopl recal winter snow 1950s 60s correct memori children massiv snow bank the record snow season thunder bai vicin 1955-56 430 cm 14 feet the record comparison remark in averag winter searchmount east lake superior receiv -- 430 cm there snow belt scatter region some upslop terrain wind pass open water some searchmount the winter 1995-96 355 cm thunder bai claim second place much region extend snow season amount well normal the current winter difficult summar vari normal normal locat lake superior normal west the record dai snowfal ontario belong nolalu west thunder bai massiv 198 cm fell 4th 8th decemb 1978 sunshin thunder bai sunniest locat ontario matter eastern canada 2200 hour bright sunshin sunshin total region tend declin north east wind the prevail wind region tend westerli compon local terrain deflect wind annual wind speed high compar region canada all time record wind gust bare exce 100 hour locat big trout lake armstrong white river reach threshold in landscap forest provid friction on lake superior wind exceed 100kmh uncommon remark gale novemb life threaten sever weather vehicl accid fatal caus winter weather danger slipperi road condit caus snow freez precipit freez rain drizzl common southern ontario occasion hazard region extrem cold temperatur time high pressur typic light wind cold brisk wind combin result extrem wind chill valu the environ canada term sever weather refer weather associ thunderstorm hurrican hurrican late stage havoc atlant canada occasion southern ontario hurrican hazel notori exampl event northwestern ontario place name thunder thunder bai thunder lake thunder cape thunderstorm unusu region annual total excess 30 extrem south fort franc atikokan the number gradual declin north almost thunderstorm occur april octob concentr june juli august occasion thunder heard snow storm thunder frighten damag lightn most forest fire start northwestern ontario caus lightn occasion human fatal happen lightn strike hail uncommon occas sever thunderstorm tornado associ thunderstorm rare region there occasion sight the fort franc area extens prairi prone extrem sever weather a hail storm summer 1996 caus consider crop properti damag grow season frost the length grow season local topographi frost occur site nearbi locat temperatur remain freez temperatur declin altitud raith locat height land short grow season on clear night cold air collect hollow typic frost prone in southwest - kenora fort franc - averag frost free period late mai thunder bai mai 31st in north week in fall frost occur earli mid-septemb south late august north these averag frost frequent occur june august again depend local terrain ground frost juli thi kind frost light prolong most crop veget surviv kind event return file localhost d itu web 20mine project uw-can-data webdata winter-canada nwclimat htm top top page 