CEREAL EXPERIMENTS AT THE AKRON FIELD STATION. 9 
TaBLE VI.—Mean, maximum, and minimum temperatures at the Akron Field Station, 
Akron, Colo., by months, 1908 to 1915, inclusive, so far as data are available, 
[Data (in ° F.) from the records of the Biophysical Laboratory of the Bureau of Plant Industry.] 
January. February. March. April. May. June. 
: 5 : ° d e : . : ° : 
Year. : : B| 8 : A : E 5 |g A |g 
g(A Sle lelelelai si eiSlslala)sisiais 
SP PP pele th HSE TES Fa 8 cl re = i asa Bana a= Fd Reed a Aas ei te tt 
OSS ee GSO, Ae av ad (aaa a aaa | Mey nea I Kel 5L | 70-|32 | 55 | 71 |, 40: | 64 1,79 49 
CD ees eS Ly Es ak SES RS 6 Vee Ue ea NW a Vr I 42 | 55 | 29 | 52] 68 | 39.| 64] 79 52 
RIK) Reena aerrmicel ee! Me Hhe. Ioan vale Pee Sala a po e 50 | 65 | 35 | 53 | 66} 40 | 67 | 82 il 
TOYS Le iS aie en 33 | 48 | 17 | 28 | 42 | 14 | 43 | 60 |} 26 | 47 | 62] 31) 58 | 73 | 43 | 70 | 87 53 
TAG) PO Ee Sie cae ee aca Oa 20 | 32 8. |-26 |-36 | 16 | 20 | 29 | 11-} 45 |. 58} 32 | 55} 70 | 42 | 63°):75 49 
TQS 37 sel aE a CR | em na eet 24 | 37 | 10 | 18 | 29 TAN 34 (47 | 20 47 1263) | 33°57) 72) 44 | 671-82 53 
EASA Sees ees i I eee Sree Sle |2425 1 21>) 25 1°39.) 12:1 37) 525) 23°|; 45 | 58 |-3845|-57-| 70} 44 | 68.4 88 50 
LAGU T hs Ses eg eae re a pal 22 | 33 | 117] 32 | 42 | 22 ; 29 | 39 | 19 | 50 | 62] 38) 52 | 64 | 41 | 60] 72 49 
Average...........| 26 | 38 | 13 | 25 | 37 i 15 | 0 47 | 61 | 33 | 55 | 69 | 41| 65 | 79| 50 
July. August. September. October. November. | December. 
. : . 5 ° ° g ss ° 5 ° = 
Year. F : : | F F S E : E F E 
PeresaMent es Se Sana | apa se | 8) ol) elo) Bg 
3 wn g 3S ra q 3 ra I 3 ra q 3S i q 3 ba qd 
o| si: Dei Serle o/s]: o|] so. Oo] a]. o]/ a |-a 
SSS Senescence weet (ot a eles 
USOB AS yeneeer A eeieaieesed 70 | 84 | 55 | 69 | 84] 54 | 66 | 84 | 48 J. eae | etches | ee |e 
BUY OO eer Sp coe YAEL ae 71 | 86 | 59 | 72 | 88 | 59 | 60 | 76 | 47 ois | See | eta |g es) (ane 
TON eer ine 74 | 90 | 59 | 67 | 84] 54] 63] 79 | 49 | 52) 71 | 35 | 40 | 56 | 24 | 31 | 47 17 
TAO) ENS S95 iy ee ea ee gears Leer 70 | 86 | 554 69} 86 | 54 | 64 | 80} 50 onl 
TAD) Ais As aie cai eae ine aaa 70 | 84} 55 | 69 | 83 |. 55 | 54°|}°68 | 41 | 47} 63 | 34 | 40-|-55 | 25 | 29 14 
OWS Bs elec ey a 1a ae tte 72 | 88 | 55 | 75 |.91 | 59.| 58 | 70} 45 | 45 | 59 | 81 |.42 | 56°] 28 | 21-1 30 13 
HQT SS oe eae aN 72 | 87-| 58 | 71 | 88 | 55 | 64.| 83] 47 |.50 | 67 | 36 | 41 | 60-| 25 | 17 | .29 7 
TOTES S eget sn sO 67 | 81:| 54 | 64 | 79 | 52 | 60 | 76 |} 47 | 51 | 69 | 36 | 38 | 55 | 24 | 28 |-40 15 
Average.....2..-.- 71 |.73° | 56° |:69.1 85°) 55) 61.) 77.) 46 |-49 1-65 | 34; |40 1°56. 1.25 | 25 | 36 13 
Table VII gives the dates of the last spring and the first fall frosts 
and the number of days in the frost-free period of each year from 1909 
to 1915, inclusive. The latest date on which frost has occurred in 
the spring during the seven years was May 20, and the average date is 
May 13. The earliest frost in the fall was September 13, and the 
average date is September 26. A temperature low enough to cause 
some injury occurred on August 25, 1910. ; 
TaBie VII.—Annual and average dates of killing frosts,' the last in spring and the first 
im autumn, with the annual and average length of the frost-free period, at the Akron 
Field Station, Akron, Colo., 1909 to 1915, inclusive. 
[Data from the records of the Biophysical Laboratory of the Bureau of Plant Industry.] 
Item. 1909 1910 1911 1912 1913 1914 1915 Average. 
Frost: : 
Lastin spring....| May 14] May 21 | May 10] May 14] May 4] May 12 | May 20] May 13 
First in fall...... 2Oct. 9] Sept. 25 | Oct. 3 | Sept. 20 | Sept. 24 | Sept.138 | Oct. 4] Sept. 26 
Frost-free period, 
COWS 52 Sosace ones 148 127 146 ee k29 _ 143 124 137 136 
1 A temperature of 32° F. is considered frost in the spring when vegetation is tender and a temperature 
below 32° F. is considered frost in the fall. 
2 Record from Leroy, Colo. 
50400°—Bull. 402 —16——2 
