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. Author manuscript; available in PMC: 2014 May 28.

Published in final edited form as: Epidemiology. 2013 May;24(3):439–446. doi: 10.1097/EDE.0b013e3182878397

Table 2. 24-hour averages of meteorologic data for Worcester, MA, 1 November 1994 – 31 December 2003.

	Overall Study Period					Cold Months ^a					Warm Months ^b
				Percentile					Percentile						Percentile

	Mean	Median	IQR	5^th	95^th	Mean	Median	IQR	5^t	95^th	Mean	Median	IQR	5^th	95^th
Apparent temperature (°C)	7.9	6.6	18.1	-6.9	25.5	- 1.3	- 1.8	6.6	- 8.6	8.2	14.7	15.3	12.3	2.0	26.9
Temperature (°C)	8.8	9.2	16.4	-7.2	23.1	0.02	0.0	8.1	-10.0	10.3	15.3	16.1	9.4	4.4	24.2
Absolute humidity (kg/m³)	0.0072	0.0058	0.01	0.0016	0.0158	0.0037	0.0033	0.0022	0.0013	0.0076	0.0098	0.0097	0.0065	0.0035	0.0169
O₃ (ppm) ^c	0.02	0.02	0.02	0.01	0.05	0.02	0.02	0.01	0.004	0.03	0.03	0.03	0.02	0.01	0.05
PM_2.5 (μg/m³) ^c	11.8	10.2	7.3	4.6	24.7	11.6	10.5	6.6	4.9	21.9	11.9	9.8	7.7	4.4	26.4

^a

January, February, March, November and December

^b

April, May, June, July, August, September, October

^c

Data from Boston, MA

IQR indicates Interquartile range