SOME PRESS BULLETINS. 
23 
between the average and the agricultural mean, it indicates that the 
rainfall in the month is quite certain. 
The records which are given in connection with this bulletin are 
the records of the stations which have maintained the records for the 
longest period of time. These include Fort Collins and Denver, on 
the plains within a few miles of the foothills, and both at an elevation 
of practically 5,000 feet. Rocky Ford is in the Arkansas Valley about 
sixty miles east of Pueblo, at an elevation of 4,176 feet. Leroy, 
(elevation 4,380 feet), Wray, (elevation 3,531 feet) and Yuma, (eleva¬ 
tion 4,147 feet), are in Northeastern Colorado; Cheyenne Wells in 
the Eastern Central (elevation 4,279 feet), and Hamps on the divide 
between the Arkansas and Platte rivers. The length of record of 
these stations ranges from 11 to 37 years. 
A critical examination indiactes that when changes occur at one 
station they generally indicate a corresponding change at other sta¬ 
tions, but that the increase or decrease is not the same. This is due 
to the fact that while there are many storms which are general in 
character, there are also local storms which affect a lesser area. Gen¬ 
erally speaking, the rainfall decreases for some distance from the 
mountains on the plains, and then increases toward the eastern border 
of the state. It increases with elevation, and prominent ridges, like 
the divide between the Arkansas and Platte rivers, show an increase 
or change in the character of the distribution, which materially helps 
the availability of the supply. 
While it is not safe to conclude that the rainfall of the whole 
eastern part of the state has increased becase the percipitation at one 
station has increased, yet generally, there is some parallelism. 
An examination of the table indicates a marked increase in all 
the stations for 1905 and 1906 over the average for a period of years. 
This is shown by the following summary: 
Place. No. Years 
on Record. 
Average. 
1905. 
1906. 
1907. 
Denver. 
37 
13.37 
17.68 
16.84 
11.83 
Fort. Collins. 
27 
14.92 
• 19.86 
19.88 
11.64 
Wray. 
II 
19.25 
22.43 
23.09 
14.23 
Hamps . 
14 
14.56 
23.60 
19.07 
10.56 
Yuma . 
16 
17.77 
23.76 
20.76 
13.53 
Leroy . 
17 
16.06 
22.18 
21.80 
16.57 
Cheyenne Wells ... 
16 
16.58 
18.31 
19.46 
9.72 
Rocky Ford. 
It 
13.15 
14.39 
14.66 
13.59 
125.66 
162.21 
155.56 
101.67 
The tables give the monthly rainfall. At the bottom is given 
the average for the whole period of the record. Manifestly in com¬ 
paring the percipitation in two different stations, it is important that 
the same years be considered at both placs, or the same months. These 
tables were made up in the summer of 1907 and thus 1907 was 
omitted. For convenience, it is given in a separate table by months, ' 
but not used in determining the averages or agricultural mean. 
