Typical for the more southerly and lower elevations of the Intermountain West, summers are extremely hot during the daytime, with maxima above for over four months on an average of 111.4 afternoons during a full year. is exceeded on average during 22.8 afternoons each year, and the record high of was set during a notorious southwestern heatwave on June 27, 1994. Humidity in early summer is very low, but increases in late summer due to the monsoon, which, between July and early October brings the majority of the year's limited precipitation. From October temperatures cool off rapidly, and by November most mornings are below , but afternoons remains comfortable to warm all through the winter, with only 10.1 afternoons failing to reach and only one afternoon every two years not topping freezing. Minima fall below freezing on an average of 121.3 mornings, but has been reached only during two exceptional cold waves in January 1962 and December 1978, when the record low of was reached on the 9th.