UV index and sunburn time in Canada
Peak UV index and how quickly unprotected skin burns, for 49 cities in Canada.
| City | Peak UV | Category | Month | Burns after |
|---|---|---|---|---|
| Toronto | 8.4 | Very high | July | 28 min |
| Montréal | 8.0 | High | July | 29 min |
| Calgary | 7.2 | High | July | 32 min |
| Ottawa | 8.0 | High | July | 29 min |
| Edmonton | 6.5 | High | June | 36 min |
| Winnipeg | 6.9 | High | July | 34 min |
| Mississauga | 8.5 | Very high | July | 28 min |
| Vancouver | 7.4 | High | July | 31 min |
| Brampton | 8.5 | Very high | July | 28 min |
| Hamilton | 8.5 | Very high | July | 27 min |
| Surrey | 7.5 | High | July | 31 min |
| Québec | 7.7 | High | July | 30 min |
| Halifax | 8.4 | Very high | July | 28 min |
| London | 8.6 | Very high | July | 27 min |
| Markham | 8.4 | Very high | July | 28 min |
| Vaughan | 8.4 | Very high | July | 28 min |
| Victoria | 7.6 | High | July | 31 min |
| Saskatoon | 6.6 | High | July | 35 min |
| Kitchener | 8.6 | Very high | July | 27 min |
| Burnaby | 7.4 | High | July | 31 min |
| Regina | 7.0 | High | July | 34 min |
| Oakville | 8.5 | Very high | July | 28 min |
| Burlington | 8.5 | Very high | July | 27 min |
| Oshawa | 8.4 | Very high | July | 28 min |
| Greater Sudbury | 7.8 | High | July | 30 min |
| Saguenay | 7.3 | High | July | 32 min |
| Coquitlam | 7.4 | High | July | 32 min |
| Barrie | 8.3 | Very high | July | 28 min |
| Kelowna | 7.3 | High | July | 32 min |
| Trois-Rivières | 7.7 | High | July | 30 min |
| Guelph | 8.6 | Very high | July | 27 min |
| Abbotsford | 7.5 | High | July | 31 min |
| St. Catharines | 8.5 | Very high | July | 27 min |
| Milton | 8.5 | Very high | July | 27 min |
| Langley | 7.4 | High | July | 31 min |
| Kingston | 8.3 | Very high | July | 28 min |
| Cambridge | 8.6 | Very high | July | 27 min |
| Sherbrooke | 8.1 | Very high | July | 29 min |
| Orléans | 8.0 | High | July | 29 min |
| Saint-Louis-de-Terrebonne | 7.9 | High | July | 30 min |
| Ajax | 8.4 | Very high | July | 28 min |
| Saanich | 7.6 | High | July | 31 min |
| Rivière-des-Prairies–Pointe-aux-Trembles | 7.9 | High | July | 30 min |
| St. John's | 7.9 | High | July | 30 min |
| Thunder Bay | 7.2 | High | July | 33 min |
| Sydney | 8.0 | Very high | July | 29 min |
| Brantford | 8.6 | Very high | July | 27 min |
| Kamloops | 7.1 | High | July | 33 min |
| Red Deer | 6.9 | High | June | 34 min |
The same UV also drives vitamin D synthesis — and stops entirely for part of the year at higher latitudes. Vitamin D winters in Canada →
Burn times are for skin type III with no sunscreen. How these are calculated