VEGREE DAYS OF FROST CF.) 
3000 | cae 
eg GIO 
Lo o0 
} Ke 
7200 | / 7 Eee as 
| 7 eae 
aia ohare 
Ne vote, 7 
6400 | Ve A 
{ Me f7S 
| if ae 
ee) Kady 
5600 | Loh 
yi ; / i 
7 ° / ° 
| 4s) 
4800 | Or 
7 dh / 
ne ede), 
: j } 
4000 | AN KOs 
Pe A 
Ll, 
// . 
' / ° /. be 
3200 Voy ih 
j / a A 
$ a a vA = 
OM | LEGEND | 
2400} / DY, 50h 6 1946 - 47 
[Sop ° ° 1947-48 | 
[ott 7 1948 - 49 
fol y 1949 — 50 
1600 } Tes parse ' - 1953-54 | 
°° A MEAN 
° rf * 
oe of 7 
Ge 
800 Lol ff 
CoG TF, 
Soh 
Se 
E50 
30 SEPT. 31 OCT. 30 NOV. 31 DEC. 31JAN.: 28 FEB. 31 MAR. 30 APR. 31 MAY 30 JUNE 
FIGURE 20. HISTORICAL DEGREE DAYS OF FROST CURVES 
36 
