<Tr> <Td_colspan="12"> Average max. and min . temperatures in ° C </Td> </Tr> <Tr> <Td_colspan="12"> Precipitation totals in mm </Td> </Tr> <P> Boise has a semi-arid continental climate (Köppen climate classification BSk), with four distinct seasons . Boise experiences hot and dry summers with highs reaching 100 ° F (38 ° C) eight days in a typical year and 90 ° F (32 ° C) on 51 days . Yet because of the aridity, average diurnal temperature variation exceeds 30 ° F (17 ° C) in summer . Winters are moderately cold, with a December average of 30.7 ° F (− 0.7 ° C), and lows falling to 0 ° F (− 18 ° C) or below on around three nights per year . Snowfall averages 19 inches (48 cm), but typically falls in bouts of 3 inches (8 cm) or less . Spring and fall are mild . Autumn is brief; spring is gradual . Extremes have ranged from − 28 ° F (− 33 ° C) on January 16, 1888 to 111 ° F (44 ° C), as recently as July 19, 1960; temperatures have reached − 25 ° F (− 32 ° C) and 110 ° F (43 ° C) as recently as December 22, 1990 and June 28, 2015, respectively . Precipitation is usually infrequent and light, especially so during the summer months . It averages approximately 11 inches annually . </P> <P> Tornadoes are rare in Ada County and the Boise area . Since 1950, only twelve (12) tornadoes have been documented within the county, and four of those were during the same storm on August 3, 2000, which is also the most recent date a tornado was documented in the area . None of the tornadoes have been ranked higher than an "F1" on the Fujita scale, and no injuries or fatalities were ever documented . </P>

What is the climate like in boise idaho
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