il 
CEREAL EXPERIMENTS ON THE CHEYENNE EXPERIMENT FARM. 
TEMPERATURE. 
The maximum, minimum, and mean temperatures for the four 
months, April to July, of each year during the 16-year period from 
1900 to 1915, inclusive, are shown in Table IV. The highest tem- 
perature recorded during the entire period was 95° F. and the lowest 
4°F. The summers are not extremely hot and the nights are always 
cool. 
TaBLe LV.— Maximum, minimum, and mean temperatures at Cheyenne, Wyo., by months, 
from April to July of each year, for the 16-year period, 1900 to 1915, inclusive. 
[Data (in ° F.) from the records of the United States Weather Bureau. ] 
April. May. June. July 
a M Mi M Mi | | M Mi M M 
ax- in- ax- in- ax- in- Max- in 
imum. |imum Mean imum. |imum Mean. imum. |imum. Mean imum. |imum Mean 
1900.......- 69 6 40.2 81 25 54.8 92 40 65. 4 90 39 64.9 
OOS es 8 79 Sl 4002 77 BL oy) G83, 7/ 90 35 | 60.0 95 44 71.4 
NOO2 Se 74 9 41.6 82 28 | 52.8 92 37 61.0 93 40 63.8 
NGOS Ra Tal 4 40.0 Ue 24 48. 0 88 30 56.9 89 40 66.8 
MOO4 72 15 41.5 Ta 26 49.2 80 36 Dien 87 37 63. 2 
ICO 35 ae 73 12 Boo 77 25 47.2 88 42 61.6 88 42 63.8 
NGOGS 5 sey 74 16 43.2 ate ih 51.0 88 33 57.9 88 39 62.9 
MOOT eee 72 15 39.3 80 8| 45.4 83 36 58.1 91 43 66.3 
NGOS ees 75 7 44,2 81 ORY Wel 85 40 57.9 89 36 65. 0 
10S eee 70 10 36. 0 75 18; 46.8 89 41 61.3 93 44 68. 0 
GTO SL oe: 82 21 46. 4 79 25.) 49N6 91 37 62.7 95 43 69. 2 
LOW 2 2 71 14 41.4 79 25) ||| D262 87 43 64.6 86 42 64.7 
OTD 62 17 40. 2 81 28 50. 4 86 33 58.5 86 46 65. 0 
Gays WA esi 73 19 43.1 81 28 52.0 88 40 60. 8 92 43 65. 2 
TUG Lee Ps i 67 12 40. 2 76 PA taal 85 4] 61.4 86 43 66. 6 
TI) a= eee 70 26 46.0 79 21 46. 4 78 29 54.6 89 33 62.3 
Average... 72 | 13 | 41.3 79 24 | 49.9 87 37 | 59.9 90 41 | 65.6 
Data showing the dates of the latest frost in spring and the first 
frost in autumn and the length of the frost-free period for each year 
from 1900 to 1916 are presented in Table V. These data were 
obtained from the records of the United States Weather Bureau at 
Cheyenne, Wyo. 
TaBLe V.—Dates of killing frosts, the last in spring and the first in autumn, with the 
length of the frost-free period, at Cheyenne, Wyo., in each year, 1900 to 1915, inclusive. 
[Data obtained from the records of the United States Weather Bureau.] 
| 
Dates of killing Dates of killing 
frosts. frosts. 
Frost-free Frost-free 
Year. period. Year: period. 
Last in | First in Last in | First in 
spring. | autumn. spring. | autumn. 
Days. Days. 
NEO se eee eae ae May 19.| Sept. 26 129) ||| 1909 Sees ee ee May 25 | Sept. 22 119 
IG Oils ag ets Ss Sah May 22 | Sept. 16 7. AUG eee vererersy ac ats ret May 22 | Aug. 25 94 
IS OD Retne te oh Scr: May 21 | Sept. 12 GUAR Sead a OTL es Spee oer May 27] Oct. 19 144 
TIO 8 ey aye meee June 1] Sept. 14 105) |PIOI eRe eoeee eee. May 14 | Sept. 15 123 
NO QA pete sic sel. Wien? Il Nos aClOs6se VAG HSS eee eet ee May 3 | Sept. 20 139 
IC Soe SASS eee May 16| Oct. 9 145 | ONaeeAe ee teens May 7 | Sept. 14 130 
ICU3 5 jabato May 6] Oct. 4 UO MOMS scouseccoodcece June 13 | Oct. 5 114 
WO Sas Saeco Oe aee ee May 14 | Sept. 20 128 
OOS Eyre soe sca ss May 10 | Sept. 26 138 Average......-.-. May 18 | Sept. 21 125 
