climate (Köppen type Dfb) in the central and most of the eastern parts of the province, as well as the Cypress Hills; drying off to a semi-arid steppe climate (Köppen type BSk) in the southwestern part of the province. Drought can affect agricultural areas during long periods with little or no precipitation at all. The northern parts of Saskatchewan – from about La Ronge northward – have a subarctic climate (Köppen Dfc) with a shorter summer season. Summers can get very hot, sometimes above during the day, and with humidity decreasing from northeast to southwest. Warm southern winds blow from the plains and intermontane regions of the Western United States during much of July and August, very cool or hot but changeable air masses often occur during spring and in September. Winters are usually bitterly cold, with frequent Arctic air descending from the north. with high temperatures not breaking for weeks at a time. Warm chinook winds often blow from the west, bringing periods of mild weather. Annual precipitation averages 30 to 45 centimetres (12 to 18 inches) across the province, with the bulk of rain falling in June, July, and August. Saskatchewan is one of the most tornado-active parts of Canada, averaging roughly 12 to 18 tornadoes per year, some violent. In 2012, 33 tornadoes were reported in the province. The Regina Cyclone took place in June 1912 when 28 people died in an F4 Fujita scale tornado. Severe and non-severe thunderstorm events occur in Saskatchewan, usually from early spring to late summer. Hail, strong winds and isolated tornadoes are a common occurrence. The hottest temperature ever recorded in Saskatchewan was when the temperature rose to in Midale and Yellow Grass. The coldest ever recorded in the province was in Prince Albert, which is north of Saskatoon. Climate change The effects of climate change in Saskatchewan are now being observed in parts of the province. There is evidence of reduction of biomass in Saskatchewan's boreal forests (as with those of other Canadian prairie provinces) is linked by researchers to drought-related water stress, stemming from global warming, most likely caused by greenhouse gas emissions. While studies, as early as 1988 (Williams, et al., 1988) have shown climate change will affect agriculture, whether the effects can be mitigated through adaptations of cultivars, or crops, is less clear. Resiliency of ecosystems may decline with large changes in temperature. The provincial government has