MONTHLY CLIMATOLOGICAL SUMMARY for DEC. 2009 NAME: Charleswood CITY: Winnipeg STATE: MB ELEV: 235 m LAT: 49° 54' 00" N LONG: 97° 18' 00" W TEMPERATURE (°C), RAIN (mm), SNOW/SOG (cm), WIND SPEED (km/h) HEAT AVG MEAN DEG WIND DOM DAY TEMP HIGH TIME LOW TIME DAYS RAIN SNOW SPEED HIGH TIME DIR SOG ------------------------------------------------------------------------------------ 1 -2.2 -0.9 2:00p -3.7 12:15a 20.5 0.0 TR 1.0 17.7 2:15p N 0 2 -5.8 -3.0 12:15a -8.9 12:00m 24.1 0.0 0.6 2.7 25.7 12:00p N T 3 -9.4 -7.2 2:00p -12.0 8:30a 27.7 0.0 0.6 2.6 27.4 9:45a N T 4 -11.8 -9.1 1:15p -16.0 12:00m 30.2 0.0 TR 0.2 17.7 3:00a NW 1 5 -12.1 -7.4 2:00p -18.0 3:30a 30.4 0.0 TR 1.6 20.9 9:45p N 1 6 -9.8 -7.3 2:00p -14.1 10:45p 28.1 0.0 0.4 1.3 19.3 2:15p NNW 1 7 -17.0 -12.6 2:00p -19.8 7:00a 35.3 0.0 0.0 0.0 11.3 1:45p WNW 2 8 -21.1 -17.5 1:15p -24.6 11:45p 39.3 0.0 0.0 0.2 11.3 11:00a WNW 2 9 -23.8 -18.7 2:15p -27.0 12:00m 42.1 0.0 0.0 0.0 8.0 1:00p NNW 2 10 -23.2 -17.1 2:00p -28.0 3:00a 41.5 0.0 0.0 0.0 8.0 12:45p WNW 1 11 -21.2 -15.2 10:00p -27.5 8:00a 39.5 0.0 0.0 0.5 17.7 2:00p SSW 1 12 -21.8 -16.9 12:15a -26.7 10:30p 40.1 0.0 0.4 3.4 25.7 7:00a N 1 13 -26.1 -22.3 1:45p -28.8 6:45a 44.4 0.0 0.0 1.0 25.7 12:15a SW 2 14 -23.1 -18.6 4:00p -27.2 1:15a 41.4 0.0 0.0 0.2 22.5 9:45p NW 2 15 -23.9 -20.2 1:30p -26.7 8:30a 42.2 0.0 0.0 0.3 17.7 8:45p SSW 2 16 -16.6 -11.7 12:00m -22.8 12:15a 34.9 0.0 0.0 1.3 30.6 11:30p SSW 2 17 -11.6 -7.1 2:00p -15.0 10:45p 29.9 0.0 0.0 1.0 32.2 12:30a SSW 2 18 -10.1 -7.6 2:15p -13.9 1:00a 28.4 0.0 TR 0.3 9.7 11:15a NNW 2 19 -9.1 -8.1 10:45p -11.3 1:30a 27.4 0.0 0.6 0.3 11.3 12:45p NNW 2 20 -8.6 -5.3 1:30p -9.7 2:30a 20.4 0.0 1.2 0.5 17.7 11:15p WSW 2 21 -13.9 -8.9 1:15p -18.8 9:45p 25.8 0.0 0.0 0.0 9.7 4:45a WNW 4 22 -9.5 -7.6 2:45p -16.7 9:00a 17.7 0.0 TR 0.0 8.0 2:00p WNW 4 23 -6.5 -3.9 6:30p -9.1 5:00a 24.8 0.0 1.0 0.0 8.0 10:00a NW 4 24 -4.6 -4.0 3:30a -6.3 11:30p 17.9 0.0 5.0 0.6 16.1 12:15p NNE 6 25 -6.7 -5.5 5:30p -7.8 7:45a 25.0 0.0 8.0 12.9 48.3 3:15p N 10 26 -6.8 -4.6 4:45p -8.5 8:15a 25.1 0.0 1.0 11.7 45.1 4:00a N 19 27 -8.4 -6.3 1:45p -10.8 9:45a 26.8 0.0 TR 3.4 35.4 11:45p N 19 28 -16.8 -9.1 12:15a -22.2 10:45p 35.1 0.0 0.0 2.4 29.0 5:15a N 19 29 -17.4 -13.4 2:30p -22.6 1:00a 35.7 0.0 0.0 3.4 32.2 1:30p S 19 30 -13.8 -11.9 2:15p -17.3 1:15a 32.1 0.0 1.4 1.4 22.5 8:45p N 19 31 -20.6 -17.1 12:15a -23.9 8:15a 38.5 0.0 0.0 0.6 25.7 12:30a N 20 ------------------------------------------------------------------------------------- -14.0 -0.9 1 -28.8 13 972.0 0.0 0.0 20.2 48.3 25 N DEC 2009 HIGHLIGHTS.. Near normal.. sort of.. The final numbers on December 2009 showed a month with near normal temperatures and snowfall, but a closer look at the month shows those numbers don't really tell the story of the weather in December 2009. With a monthly mean temperature of -14.9C at Winnipeg airport, the month was just 0.5C below normal (0.4C above normal at my site), which falls in the "near normal" range. However the month was characterized by a colder than normal first half that was balanced by a milder than normal second half. Snowfall was a similar story. Up to the 24th, the big story of the month was the lack of snowfall with only 3 cm of snow in the first 3 weeks of December, and a meager 4 cm on the ground. However a major winter storm system south of the border brought 15 cm of snow to the Winnipeg area for Christmas Eve and Christmas Day, making up the snowfall shortfall for the month. Snowfall at my site totalled 20 cm in December, bang on average for the month. The same storm system brought record snowfall south of the border with up to 63 cm (25") in Grand Forks ND. Other than that storm system, the weather was very quiet during December with minimal weather systems affecting southern Manitoba. Overall, a quiet month with a snowy holiday season.