Table 1.

Impact of weather factors on hourly trip counts in Greater Boston.

			Weekday				Weekend
Season	Variable	All trips	All weekday	Commute	Transit (commute)	Non-commute
All	Temperature (°C)	1.009 *	1.008 *	1.006 *	1.005 *	1.011 *	1.013 *
	Humidity (%)	0.995 *	0.996 *	0.998 *	0.998 *	0.995 *	0.993 *
	Wind speed (km/h)	1.004 *	1.003 *			1.004 *	1.005 *
	Precipitation (mm/h)	1.023 *	1.029 *			1.041 *
	Snow	0.845 *	0.730 *	0.708 *	0.773	0.728 *
	Thunder		2.071 *	1.527
	Cloud cover	1.120 *	1.129 *			1.126 *	1.063 *
	Heavy cloud cover	1.045 *	1.069 *	1.079 *	1.085 *	1.076 *
	Fog	1.083	1.121			1.188	1.191
Winter	Temperature (°C)	1.017 *	1.015 *	1.004		1.026 *	1.027 *
	Humidity (%)	0.996 *	0.997 *			0.995 *	0.994 *
	Wind speed (km/h)	0.998 *	0.998	0.994 *			0.997
	Precipitation (mm/h)						0.861 *
	Snow	0.890 *	0.844 *	0.783 *		0.801 *	1.141
	Thunder
	Cloud cover	1.139 *	1.179 *	1.117 *		1.078
	Heavy cloud cover
	Fog				0.486 *	1.192
Spring	Temperature (°C)	1.025 *	1.021 *	1.018 *	1.018 *	1.022 *	1.043 *
	Humidity (%)	0.997 *	0.997 *	0.998 *		0.997 *
	Wind speed (km/h)	1.004 *	1.003			1.003	1.007 *
	Precipitation (mm/h)		0.929			0.869 *
	Snow
	Thunder	0.311 *					0.261 *
	Cloud cover	1.078 *				1.112 *	1.198 *
	Heavy cloud cover	1.080 *	1.138 *	1.143 *	1.214 *	1.106 *	0.869 *
	Fog		2.291 *
Summer	Temperature (°C)	1.012 *				1.014 *	1.021
	Humidity (%)	0.993 *	0.993 *	0.997		0.992 *	0.994 *
	Wind speed (km/h)	1.008 *	1.004	1.011 *	1.010		1.017 *
	Precipitation (mm/h)
	Snow
	Thunder
	Cloud cover	1.070 *				1.089	1.108
	Heavy cloud cover	1.094 *	1.145 *	1.116 *	1.169	1.114 *
	Fog
Autumn	Temperature (°C)	1.019 *	1.015 *	1.010 *	1.008 *	1.018 *	1.025 *
	Humidity (%)	0.993 *	0.995 *	0.997 *	0.997 *	0.994 *	0.986 *
	Wind speed (km/h)	1.005 *	1.006 *	1.003 *		1.007 *	1.005 *
	Precipitation (mm/h)	1.087 *	1.070 *			1.079 *	1.151 *
	Snow	0.862	0.340 *	0.012 *		0.448 *
	Thunder		1.828				0.624
	Cloud cover	1.190 *	1.232 *			1.214 *
	Heavy cloud cover
	Fog	1.674 *	1.465 *				2.604 *

Note: Coefficients indicated with no asterisk are significant at α = 0.05 and coefficients indicated with an asterisk (*) are significant at α = 0.01. Variables corresponding to all insignificant coefficients were omitted during the model estimation process.