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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