Period	Slope	Intercept	R²	Sky transmission
Period	Slope	Intercept	R²	Cloudless	Overcast
CENTRAL COASTAL PLAIN, BET DAGAN. 1956-2013
1956-1961	−0.377	0.79	0.63	0.79	0.41
1962-1967	−0.439	0.759	0.51	0.76	0.32
1968-1973	−0.482	0.779	0.77	0.78	0.3
1974-1979	−0.541	0.789	0.74	0.79	0.25
1980-1985	−0.424	0.708	0.58	0.71	0.28
1986-1991	−0.544	0.775	0.71	0.78	0.23
1992-1997	−0.536	0.761	0.66	0.76	0.23
1998-2003	−0.518	0.731	0.61	0.73	0.21
2004-2009	−0.548	0.78	0.64	0.78	0.23
2010-2013	−0.564	0.773	0.58	0.77	0.21
1956-2013	−0.471	0.756	0.51	0.76	0.28
CENTRAL HILL REGION, JERUSALEM. 1954-2014
1954-1963	−0.336	0.774	0.96	0.77	0.44
1968-1975	−0.241	0.732	0.48	0.73	0.49
1986-1995	−0.431	0.722	0.85	0.72	0.29
1996-2005	−0.388	0.75	0.89	0.75	0.36
2006-2014	−0.475	0.776	0.91	0.78	0.3
THREE SITES, 1953-1961 (for details see Stanhill, 1962)
1953-1961	−0.262	0.771	0.56	0.77	0.51
THREE SITES, 1992-1994 (for details see Stanhill and Ianetz, 1997)
1992-1994	−0.464	0.729	0.8	0.73	0.27