Pennsylvania Fly Fishing Hatch Chart

Hatch Common Name	Hook Size	Start Date	Start time	Latin Name
Little Blue Winged Olive	16-20	15-Mar	10:00 AM - 4:00 PM	Ephemerella & Baetis
Blue Quill	16-18	17-Apr	11:30 AM - 3:00 PM	Paraleptophlebia adoptiva
Quill Gordon	12-14	17-Apr	1:30 PM - 6:30 PM	Epeorus pleuralis
Hendrickson Female	12	19-Apr	2:00 PM - 6:30 PM	Ephemerella subvaria
Red Quill Male	14	19-Apr	2:00 PM - 6:30 PM	Ephemerella subvaria
Sulphurs	14-16	10-May	7:00 PM	Ephemerella rotunda, dorthea, & others
March Brown	10-12	12-May	All Day	Stenonema vicarium
Gray Fox	10-12	12-May	10:00AM - Noon	Stenonema fuscum
Light Cahill	14	18-May	8:00 PM	Stenacron
Blue Winged Olive	14-18	20-May	10:00 AM - 3:00 PM	Baetidae
Green Drake	8-10	24-May	8:00 PM	Ephemera guttulata
Brown Drake	10-14	26-May	8:00 PM	Ephemera simulans
Slate Drake	12-14	26-May	5:00 PM	Isonychia bicolor & sadleri
Trico	20-24	15-Jul	7:00 AM -Noon	Tricorythodes stygiatus
White Fly	10-14	Early August	7:30 PM	Ephoron lekon
Slate Drake	12-14	August-October	Noon - 4:00 PM	Isonychia

 

In the Pocketguide to Pennsylvania Hatches by Charles Meck & Paul Weamer, The following hatch chart variation map is shown to help adjust for local variations according to traditional temperature ranges.

Since there is such a range of hatches throughout the state, which region or area would you say that the hatch chart info that you posted is based on? I'm trying to get a better understanding of how it might be different from where i am locally as well as when i travel to fish other parts of the state in the spring.

 

What is the source of the hatch chart in the OP?