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Table 2 Average daily meteorological conditions at Burbank Bob Hope Airport for each air mass type for the winter season (December, January, and February) from 1979 to 2010

From: Heat/mortality sensitivities in Los Angeles during winter: a unique phenomenon in the United States

Air mass Air mass frequency (%) Average maximum temperature (°C) Average minimum temperature (°C) Average daily temperature (°C)
Dry Moderate 33.0 19.3 (3.1) 5.5 (2.0) 12.4 (2.2)
Dry Polar 1.9 14.8 (3.0) 3.5 (2.8) 9.2 (2.3)
Dry Tropical 19.1 25.7 (2.8) 9.2 (2.8) 17.4 (2.3)
Moist Moderate 13.8 16.8 (2.4) 9.9 (2.0) 13.3 (1.7)
Moist Polar 5.6 14.5 (2.4) 7.1 (2.1) 10.8 (1.8)
Moist Tropical 8.9 21.2 (2.5) 10.1 (1.9) 15.7 (1.6)
Transition 10.4 20.0 (4.6) 7.2 (3.3) 13.6 (3.3)
Moist Tropical Plus 1.8 24.2 (3.0) 11.8 (1.8) 18.0 (1.6)
Missing 5.5 n/a n/a n/a
Total 100 20.2 (4.5) 7.7 (3.2) 14.0 (3.1)
  1. Standard deviations are in parentheses, and oppressive air masses are in bold