<P> Pullman's climate is classified as dry - summer humid continental (Köppen Dsb), using the 0 ° threshold for mean coldest winter month; it nearly qualifies as having a warm - summer Mediterranean climate (Köppen Csb). This climate is typified by warm, dry summers followed by cold, snowy winters with short transitional seasons in between . Owing to the protective nature of the Cascade Range to its west, clear skies occur regularly throughout the year and rainfall is drastically less frequent in comparison to cities west of the mountains . Clouds of any variety are especially scant between June and September, which contributes to a diurnal temperature variation that is much higher during the summer compared to winter . Pullman averages 21 inches (530 mm) of precipitation throughout the year . The warmest month is August with an average daily high of 82 degrees (27.8 ° C), while January is the coldest month with an average daily high of 35 degrees (1.67 ° C). </P> <P> Precipitation is highly seasonal . Virtually no precipitation occurs between June and September, while the period of mid November through mid March commonly receives snowfall . Rain, though sporadic, is mostly recorded during the transitional seasons . December and January are the snowiest months, respectively, averaging 7.80 inches and 7.09 inches each . Areas of snowpack accumulate every winter and frequently last into March before melting entirely . Snowfall can also occur in the transitional months of October and April, though it is uncommon and usually melts within a day . </P> <Table> <Tr> <Th_colspan="14"> (hide) Climate data for Pullman, Washington </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> 57 (14) </Td> <Td> 66 (19) </Td> <Td> 73 (23) </Td> <Td> 88 (31) </Td> <Td> 97 (36) </Td> <Td> 104 (40) </Td> <Td> 104 (40) </Td> <Td> 110 (43) </Td> <Td> 100 (38) </Td> <Td> 90 (32) </Td> <Td> 71 (22) </Td> <Td> 59 (15) </Td> <Td> 110 (43) </Td> </Tr> <Tr> <Th> Average high ° F (° C) </Th> <Td> 35 (2) </Td> <Td> 41 (5) </Td> <Td> 48 (9) </Td> <Td> 57 (14) </Td> <Td> 65 (18) </Td> <Td> 72 (22) </Td> <Td> 82 (28) </Td> <Td> 83 (28) </Td> <Td> 74 (23) </Td> <Td> 60 (16) </Td> <Td> 43 (6) </Td> <Td> 35 (2) </Td> <Td> 57.9 (14.4) </Td> </Tr> <Tr> <Th> Average low ° F (° C) </Th> <Td> 24 (− 4) </Td> <Td> 27 (− 3) </Td> <Td> 31 (− 1) </Td> <Td> 36 (2) </Td> <Td> 42 (6) </Td> <Td> 47 (8) </Td> <Td> 50 (10) </Td> <Td> 50 (10) </Td> <Td> 44 (7) </Td> <Td> 37 (3) </Td> <Td> 30 (− 1) </Td> <Td> 24 (− 4) </Td> <Td> 36.8 (2.8) </Td> </Tr> <Tr> <Th> Record low ° F (° C) </Th> <Td> − 29 (− 34) </Td> <Td> − 24 (− 31) </Td> <Td> − 4 (− 20) </Td> <Td> 13 (− 11) </Td> <Td> 21 (− 6) </Td> <Td> 30 (− 1) </Td> <Td> 32 (0) </Td> <Td> 30 (− 1) </Td> <Td> 20 (− 7) </Td> <Td> 7 (− 14) </Td> <Td> − 14 (− 26) </Td> <Td> − 32 (− 36) </Td> <Td> − 32 (− 36) </Td> </Tr> <Tr> <Th> Average precipitation inches (mm) </Th> <Td> 2.46 (62.5) </Td> <Td> 2.10 (53.3) </Td> <Td> 2.01 (51.1) </Td> <Td> 1.72 (43.7) </Td> <Td> 1.77 (45) </Td> <Td> 1.30 (33) </Td> <Td> 0.79 (20.1) </Td> <Td> 0.89 (22.6) </Td> <Td> 0.88 (22.4) </Td> <Td> 1.48 (37.6) </Td> <Td> 2.83 (71.9) </Td> <Td> 2.78 (70.6) </Td> <Td> 21.01 (533.7) </Td> </Tr> <Tr> <Th> Average snowfall inches (cm) </Th> <Td> 7.09 (18.01) </Td> <Td> 4.43 (11.25) </Td> <Td> 3.57 (9.07) </Td> <Td> 1.63 (4.14) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td>. 49 (1.24) </Td> <Td> 3.48 (8.84) </Td> <Td> 7.80 (19.81) </Td> <Td> 28.49 (72.36) </Td> </Tr> <Tr> <Td_colspan="14"> Source: The Weather Channel </Td> </Tr> </Table> <Tr> <Th_colspan="14"> (hide) Climate data for Pullman, Washington </Th> </Tr>

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