Night Light of Holyoke (Massachusetts) from space (United States) Src. Average luminocity for 10x10km area is 65.7485% and for 50x50km: 21.9872%.
Square area 10x10 km:
 14.09%
 16.06%
 11.52%
 12.58%
 6.36%
 5.76%
 4.55%
 11.06%
 13.33%
 4.7%
 0%Square area 50x50 km:
 3.15%
 3.61%
 3.38%
 3.21%
 3.35%
 3.26%
 3.2%
 3.53%
 4.82%
 10.47%
 58.04%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
42° 43' 22.7" North, 73° 19' 9.6" West
42° 12' 15.3" North, 72° 36' 58.3" West
41° 40' 52.6" North, 71° 54' 47.1" West
Some cities around Holyoke sort by population:
• Springfield
		11.6 km =7.2 mi, 
169°
• Chicopee
		6.2 km =3.9 mi, 
173°
• North Chicopee
		2.7 km =1.7 mi, 
149°
• West Springfield
		10.8 km =6.7 mi, 
181°
• Ludlow
		12.6 km =7.8 mi, 
113°
• South Hadley
		6.9 km =4.3 mi, 
29°
• Easthampton
		8.2 km =5.1 mi, 
327°
• Southampton
		9.8 km =6.1 mi, 
286°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016