Table 3.

Station specific Growing Degree Hours (GDH) and corresponding Root Mean Square error (RMS) and p value and correlation coefficient of start and end dates with initial date being Mar 1^st. The base temperatures are 8 and 5 C° for birch and oak pollen, respectively.

Station		Start Date				End Date
		GDH	RMS	r	p	GDH	RMS	r	p
Fargo, ND	Birch	1794	5	0.89	0.000	4859	11	0.50	0.121
	Oak	3216	8	0.67	0.025	6846	8	0.56	0.071
College Station, TX	Birch	2651	13	−0.12	0.817	11318	19	−0.06	0.911
	Oak	2246	8	0.12	0.738	7926	5	0.67	0.036
Omaha, NE	Birch	2414	2	0.96	0.009	13385	6	0.78	0.121
	Oak	6030	6	0.95	0.000	10435	7	0.58	0.080
Pleasanton, CA	Birch	1469	4	0.83	0.003	5996	8	0.71	0.022
	Oak	1758	7	0.37	0.294	7859	15	0.88	0.000
Cherry Hill, NJ	Birch	2265	4	0.88	0.000	6637	7	0.68	0.011
	Oak	5088	4	0.75	0.003	12213	10	0.61	0.027
Newark, NJ	Birch	3194	6	0.58	0.064	8613	9	0.48	0.131
	Oak	5673	6	0.67	0.008	12168	6	0.70	0.003