<P> The combination of high elevation and low humidity provide mild weather conditions throughout most of the year . The predominantly clear air and high elevation radiates daytime heating effectively resulting in overnight temperatures generally much lower than the daytime temperature . This means a 55 degree day in January can drop to 15 at night . Winter nights in fact can be extremely cold, with temperatures dropping below 0 ° F (− 17.8 ° C) on 5 to 6 nights per year . </P> <P> Winter weather patterns in Flagstaff are cyclonic and frontal in nature, originating in the eastern Pacific Ocean . These deliver periodic, widespread snowfall followed by extended periods of sunny weather . The area's generally stable weather pattern is broken by brief, but often intense, afternoon downpours and dramatic thunderstorms common during the monsoon of July and August . Summer temperatures are moderate and high temperatures average around 82 ° F (27.8 ° C). Extreme temperatures range from − 30 ° F (− 34.4 ° C) on January 22, 1937 up to 97 ° F (36.1 ° C) on July 5, 1973, respectively . The weather in Flagstaff is generally sunny, with much more sunshine than other snowy cities like New York City, Chicago, Boston and even Denver . Flagstaff is the only city in Arizona never to have reported temperatures of 100 ° F (38 ° C) or higher . </P> <P> The annual snowfall averages 100.3 inches (254.76 cm), placing Flagstaff among the snowiest incorporated cities in the United States . Overall, the city features an average of 277 days without measurable precipitation each year . Despite snowstorms often being spread weeks apart, snow often covers the ground for weeks after major winter storms due to the low night temperatures refreezing the snowpack, even when daytime temperatures are above freezing . The maximum daily snow cover has been 83 inches (210.82 cm) on December 20, 1967, although the mean maximum for a full winter is only 20 inches (50.80 cm) and the lowest maximum only 6 inches (15.24 cm) in the dry winter of 1955--56 . However, due to the infrequent and scattered nature of the snowstorms, persistent snow pack into spring is rare . One notable exception occurred during the severe winter of 1915--16, when successive Pacific storms buried the city under over 70 inches (177.80 cm) of snow, and some residents were snowbound in their homes for several days . </P> <Table> <Tr> <Th_colspan="14"> show Climate data for Flagstaff Pulliam Airport, Arizona (1981--2010 normals, extremes 1898--present) </Th> </Tr> <Tr> <Th> Month </Th> <Th> Jan </Th> <Th> Feb </Th> <Th> Mar </Th> <Th> Apr </Th> <Th> May </Th> <Th> Jun </Th> <Th> Jul </Th> <Th> Aug </Th> <Th> Sep </Th> <Th> Oct </Th> <Th> Nov </Th> <Th> Dec </Th> <Th> Year </Th> </Tr> <Tr> <Th> Record high ° F (° C) </Th> <Td> 66 (19) </Td> <Td> 71 (22) </Td> <Td> 73 (23) </Td> <Td> 80 (27) </Td> <Td> 89 (32) </Td> <Td> 96 (36) </Td> <Td> 97 (36) </Td> <Td> 93 (34) </Td> <Td> 91 (33) </Td> <Td> 85 (29) </Td> <Td> 74 (23) </Td> <Td> 68 (20) </Td> <Td> 97 (36) </Td> </Tr> <Tr> <Th> Average high ° F (° C) </Th> <Td> 42.5 (5.8) </Td> <Td> 44.8 (7.1) </Td> <Td> 50.4 (10.2) </Td> <Td> 58.2 (14.6) </Td> <Td> 68.1 (20.1) </Td> <Td> 77.9 (25.5) </Td> <Td> 81.2 (27.3) </Td> <Td> 78.4 (25.8) </Td> <Td> 72.9 (22.7) </Td> <Td> 62.0 (16.7) </Td> <Td> 50.5 (10.3) </Td> <Td> 42.5 (5.8) </Td> <Td> 60.8 (16) </Td> </Tr> <Tr> <Th> Average low ° F (° C) </Th> <Td> 17.3 (− 8.2) </Td> <Td> 19.3 (− 7.1) </Td> <Td> 23.6 (− 4.7) </Td> <Td> 28.5 (− 1.9) </Td> <Td> 35.0 (1.7) </Td> <Td> 41.9 (5.5) </Td> <Td> 50.9 (10.5) </Td> <Td> 50.1 (10.1) </Td> <Td> 42.0 (5.6) </Td> <Td> 31.5 (− 0.3) </Td> <Td> 22.9 (− 5.1) </Td> <Td> 16.8 (− 8.4) </Td> <Td> 31.7 (− 0.2) </Td> </Tr> <Tr> <Th> Record low ° F (° C) </Th> <Td> − 30 (− 34) </Td> <Td> − 23 (− 31) </Td> <Td> − 16 (− 27) </Td> <Td> − 2 (− 19) </Td> <Td> 7 (− 14) </Td> <Td> 22 (− 6) </Td> <Td> 32 (0) </Td> <Td> 24 (− 4) </Td> <Td> 20 (− 7) </Td> <Td> − 2 (− 19) </Td> <Td> − 13 (− 25) </Td> <Td> − 23 (− 31) </Td> <Td> − 30 (− 34) </Td> </Tr> <Tr> <Th> Average precipitation inches (mm) </Th> <Td> 2.05 (52.1) </Td> <Td> 2.16 (54.9) </Td> <Td> 2.12 (53.8) </Td> <Td> 1.15 (29.2) </Td> <Td> 0.63 (16) </Td> <Td> 0.36 (9.1) </Td> <Td> 2.61 (66.3) </Td> <Td> 3.11 (79) </Td> <Td> 2.38 (60.5) </Td> <Td> 1.66 (42.2) </Td> <Td> 1.76 (44.7) </Td> <Td> 1.87 (47.5) </Td> <Td> 21.86 (555.3) </Td> </Tr> <Tr> <Th> Average snowfall inches (cm) </Th> <Td> 23.2 (58.9) </Td> <Td> 20.9 (53.1) </Td> <Td> 20.7 (52.6) </Td> <Td> 7.1 (18) </Td> <Td> 0.7 (1.8) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> trace </Td> <Td> 1.5 (3.8) </Td> <Td> 10.7 (27.2) </Td> <Td> 16.9 (42.9) </Td> <Td> 101.7 (258.3) </Td> </Tr> <Tr> <Th> Average precipitation days (≥ 0.01 in) </Th> <Td> 7.6 </Td> <Td> 8.1 </Td> <Td> 8.2 </Td> <Td> 5.8 </Td> <Td> 4.5 </Td> <Td> 2.6 </Td> <Td> 11.6 </Td> <Td> 14.0 </Td> <Td> 7.9 </Td> <Td> 5.5 </Td> <Td> 4.9 </Td> <Td> 7.0 </Td> <Td> 87.7 </Td> </Tr> <Tr> <Th> Average snowy days (≥ 0.1 in) </Th> <Td> 7.5 </Td> <Td> 6.9 </Td> <Td> 6.6 </Td> <Td> 3.0 </Td> <Td> 0.8 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0.6 </Td> <Td> 3.0 </Td> <Td> 6.5 </Td> <Td> 34.9 </Td> </Tr> <Tr> <Th> Average relative humidity (%) </Th> <Td> 61.9 </Td> <Td> 59.5 </Td> <Td> 54.9 </Td> <Td> 46.5 </Td> <Td> 39.4 </Td> <Td> 33.6 </Td> <Td> 51.1 </Td> <Td> 58.1 </Td> <Td> 54.7 </Td> <Td> 52.6 </Td> <Td> 56.9 </Td> <Td> 60.6 </Td> <Td> 52.5 </Td> </Tr> <Tr> <Th> Mean monthly sunshine hours </Th> <Td> 231.7 </Td> <Td> 228.6 </Td> <Td> 286.3 </Td> <Td> 321.0 </Td> <Td> 369.5 </Td> <Td> 371.8 </Td> <Td> 324.2 </Td> <Td> 311.9 </Td> <Td> 298.5 </Td> <Td> 282.8 </Td> <Td> 229.3 </Td> <Td> 219.8 </Td> <Td> 3,475.4 </Td> </Tr> <Tr> <Th> Percent possible sunshine </Th> <Td> 74 </Td> <Td> 75 </Td> <Td> 77 </Td> <Td> 82 </Td> <Td> 85 </Td> <Td> 86 </Td> <Td> 73 </Td> <Td> 75 </Td> <Td> 80 </Td> <Td> 81 </Td> <Td> 74 </Td> <Td> 72 </Td> <Td> 78 </Td> </Tr> <Tr> <Td_colspan="14"> Source: NOAA (relative humidity 1961--1990, sun 1973--1990) </Td> </Tr> </Table>

What's the average snowfall in flagstaff arizona