Colorado Springs has a cooler, dry-winter semi-arid climate , and its location just east of the Rocky Mountains affords it the rapid warming influence from chinook winds during winter but also subjects it to drastic day-to-day variability in weather conditions. The city has abundant sunshine year-round, averaging 243 sunny days per year, and receives approximately 16.5 inches (419 mm) of annual precipitation. Due to unusually low precipitation for several years after flooding in 1999, Colorado Springs enacted lawn water restrictions in 2002. These were lifted in 2005.
Colorado Springs is one of the most active lightning strike areas in the United States. This natural phenomenon led Nikola Tesla to select Colorado Springs as the preferred location to build his lab and study electricity.
Winters range from mild to moderately cold, with December, the coldest month, averaging 30.8 °F (−0.7 °C); historically January has been the coldest month, but, in recent years, December has had both lower daily maxima and minima. Typically, there are 5.2 nights with sub-0 °F (−18 °C) lows and 23.6 days where the high does not rise above freezing.
Snowfall is usually moderate and remains on the ground briefly because of direct sun, with the city receiving 38 inches (97 cm) per season, although the mountains to the west often receive in excess of triple that amount; March is the snowiest month in the region, both by total accumulation and number of days with measurable snowfall. In addition, 8 of the top 10 heaviest 24-hour snowfalls have occurred from March to May. Summers are warm, with July, the warmest month, averaging 70.9 °F (21.6 °C), and 18 days of 90 °F (32 °C)+ highs annually. Due to the high elevation and aridity, nights are usually relatively cool and rarely does the low remain above 70 °F (21 °C). Dry weather generally prevails, but brief afternoon thunderstorms are common, especially in July and August when the city receives the majority of its annual rainfall, due to the North American Monsoon.
The first autumn freeze and the last freeze in the spring, on average, occur on October 2 and May 6, respectively; the average window for measurable snowfall (≥0.1 in or 0.25 cm) is October 21 through April 25. Extreme temperatures range from 101 °F (38 °C) on June 26, 2012 and most recently on June 21, 2016, down to −27 °F (−33 °C) on February 1, 1951, and December 9, 1919.