15 
PrecipUatitm ai dfora&ne station, Larimer County, Colo. 
Year. 
Jan. 
Feb. 
Mar. 
Apr. 
Ma\ . 
June. 
July. 
Mil-. 
Sept. 
on. 
N<-v. 
Dec. 
Total. 
Inches. 
Tnchea, 
I mius. 
Indus. 
Inches. 
Inches. 
1 nrhis. 
I miiis. 
I mins. 
Inches. 
I mius. 
I miu s. 
Inches. 
1889... 
1 . :,7 
1.84 
ii. Hi 
.65 
. Mil 
.:;:. 
1890.... 
0. 81 
0. 76 
0.71 
•2.77 
1.30 
l.o:, 
2. I-' 
:;. lo 
0.82 
L891.... 
2. 88 
8.00 
:;. 52 
L.80 
:;. 26 
1.10 
1.12 
. '.to 
l. 16 
.81 
.01 
. 02 
20.70 
1892.... 
.50 
1.80 
1.84 
1 . 69 
8.23 
.si 
2.17 
.(12 
.0(1 
.110 
.60 
18. I- 
1898-... 
.69 
2. 32 
1.88 
l.:;i 
L.76 
.:?7 
1. i:; 
1.88 
.21 
. i:; 
l.o:; 
.00 
1 1. 10 
L894.... 
.40 
. 99 
L.08 
1 . Mi 
.">. 72 
.88 
2.2^ 
1.26 
2.1:; 
. 66 
.:.( 
l . 58 
L8.75 
L896.... 
. 12 
L.60 
l. in 
1.71 
1.63 
2.53 
:}. 66 
2. 86 
.84 
2.80 
.86 
.in 
22. :;7 
L896.... 
.68 
• >•) 
•_'. 87 
L.08 
1.(12 
. 10 
3.88 
2.50 
•2.71 
.7.', 
.80 
.:*o 
17. 28 
1897.... 
.61 
1 . 68 
L.86 
1.29 
2.30 
1.79 
2.52 
2. 48 
.78 
1.1.1 
1 . 2:. 
1.20 
18.87 
1898 
.50 
l.o:. 
1 . 32 
1. 11 
3.05 
1.98 
2.19 
1 . (17 
.40 
. 00 
1.77 
. 55 
L6.86 
L899.... 
.77 
2. 82 
2. 98 
1 . 89 
.45 
1.57 
3.02 
1 . 82 
.15 
1.00 
.00 
. 65 
L6.68 
1900.... 
.'21 
1.11 
.30 
7.71 
1.30 
.91 
. 86 
. 28 
2. 19 
1 . 12 
. 17 
. Is 
K1.72 
Mean 
.71 
1.67 
1.75 
2. 19 
2. GO 
1.18 
2. 27 
1.74 
1.07 
1.11 
.69 
.08 
17.48 
Precipitation at Waterdale station, near Arkins, Colo. 
Year. 
Jan. 
Feb. 
Mar. 
Apr. 
May. 
Juno. 
July 
Aug. 
Sept. 
Oct. 
Nov. 
Dee. 
Total. 
1900.... 
Mean 
[mius. 
0.21 
. (12 
.18 
.21 
.63 
.19 
Inches. 
1.33 
.28 
.50 
.25 
1.10 
Inches. 
o. o,s 
1.50 
2.32 
.87 
1.25 
.97 
I mius, 
1.89 
1.22 
1.82 
1. 12 
.SI 
9.21 
Inches, 
4.95 
1.66 
3.61 
3.43 
.67 
1.76 
Indus. 
4.60 
1.83 
2.30 
1.86 
.92 
.45 
Inches. 
5.84 
2.58 
2.42 
1.20 
2.12 
1.05 
Indies. 
0. 57 
1.44 
1.09 
1.61 
.94 
.57 
Inches. 
0.51 
2.60 
.84 
.51 
.19 
1.72 
Indus. 
1. 15 
Inches. 
Indus, 
Inches. 
1.07 
.75 
3.30 
.18 
0.08 
.82 
1.62 
.00 
.12 
0.43 
.64 
.:.o 
.49 
.22 
,84 
72 
1.32 
2.73 
2.54 
1.04 
1.06 
1.19 
,53 
14. 92 
17.61 
11.2(1 
12. 45 
17.30 
16.60 
A comparison of the averages of the three tables shows that the 
rainfall is very evenly distributed, there being little difference between 
that of places at an elevation of 6,000 feet and of those at 9,000 feet. 
Nor does there appear in the tables anything to indicate that the pre- 
cipitation is differently distributed over the year, all three showing 
the least precipitation in winter and the most in the spring and sum- 
mer. The records cover a period scarcely long enough to make com- 
parisons or to reach conclusions. An attempt was made to ascertain 
what relation the precipitation during the winter had to the late flow of 
the river, but no conclusion was reached while considering chiefly the 
snowfall at the high altitudes. In this study the year was divided not 
at January 1, but at November 1, assuming that the snow falling after 
November 1 would remain until spring at least. This failure to reach 
a conclusion is not surprising, for the late flow is dependent as much 
upon the amount of drifting as upon the quantity of snowfall, it being 
only deep drifts that remain late. The temperature in spring is a 
factor, as is also the rainfall at that time. Warm spring rains melt 
the great drifts on the northern slopes and in the sheltered places 
rapidly. The rain, augmented by the melted snow, flows away almost 
immediately, while snow melted b}^ the sun late in the day refreezes 
to a considerable extent the succeeding night. The slower melting of 
the snow also allows the water to enter the soil and the cracks and 
crevices of the rocks, to reappear later in the season in springs which 
