OVERFLOW OF RED RIVER OF THE NORTH. 
25 
MONTHLY AND ANNUAL PRECIPITATION. 
In Table 6 the averages of the records for the watershed above 
Grand Forks are shown. The " weighted averages " for 1892 to 1919 
were computed by calculating separately the volume of monthly pre- 
cipitation in each of the five subdivisions of that watershed to find 
the total volume for the area, and then reducing that quantity to an 
equivalent depth in inches over the watershed for each month and 
year. 
Table 6. — Average precipitation on Red River watershed above Grand Forks, 
N. Dak. (compiled from record of U. S. Weather Bureau). 
Year. 
1882. 
18S3. 
1884. 
1885. 
1886. 
18S7. 
1888. 
1889. 
1890. 
1891. 
1892. 
1893. 
1894. 
1895. 
1896. 
1897. 
1898. 
1900. 
1901. 
1902. 
1903. 
1904. 
1905. 
190S. 
1907. 
190S. 
1903. 
1910. 
1911. 
1912. 
1913. 
1914. 
1915. 
1916. 
1917. 
1918. 
1919. 
No. 
testa- 
tions. 
Jan. 
In. 
0.81 
.55 
.35 
.35 
.68 
.64 
.72 
.81 
.61 
.43 
.35 
1.06 
.46 
.86 
1.22 
.09 
.51 
.28 
.32 
.20 
.71 
.38 
.38 
.19 
.60 
.29 
1.25 
.32 
.45 
.53 
.63 
1.57 
.70 
.54 
.29 
Feb. 
In. 
0.65 
.40 
.79 
.15 
.58 
.53 
.29 
* .78 
1.07 
1.21 
.71 
.82 
.34 
.38 
.67 
1.46 
.55 
.21 
.42 
.51 
.62 
.45 
.91 
.25 
.17 
.27 
1.48 
.32 
.55 
.75 
.20 
.14 
.37 
1.05 
.43 
.86 
.19 
.66 
Mar. 
In. 
1.84 
.18 
.74 
.37 
.41 
.46 
.91 
.37 
.65 
1.21 
1.17 
1.36 
1.77 
.10 
1.35 
1.23 
.84 
.76 
1.06 
1.25 
1.91 
.73 
1.66 
.57 
.64 
1.27 
.33 
.79 
.41 
.34 
1.05 
1.17 
.31 
1.64 
.42 
.34 
.74 
Apr. 
In. 
1.68 
1.17 
1.10 
2.79 
3.21 
1.70 
1.21 
1.12 
.77 
2.99 
3.15 
2.77 
3.62 
1.44 
4-H 
.94 
1.37 
1.52 
1.24 
1.85 
1.56 
1.60 
2.31 
1.41 
2.03 
.97 
1.26 
1.09 
1.61 
1.80 
2.49 
1.06 
2.09 
1.32 
2.06 
1.85 
2.35 
1.65 
May, 
In. 
3.49 
2.74 
3.05 
1.49 
1.85 
2.18 
1.69 
1.82 
1.43 
2.00 
4.07 
1.82 
2.62 
2.16 
5.17 
.89 
2.60 
4.55 
.83 
.96 
3.97 
3.12 
2.15 
5.04 
4.77 
1.56 
3.86 
4.18 
.79 
3.56 
3.81 
1.96 
2.79 
3.61 
3.35 
.27 
3.26 
3.77 
June, 
In. 
5.40 
1.48 
1.93 
4.45 
3.00 
4.42 
3.92 
1.76 
4. 61 
3.19 
3.00 
3.64 
6.34 
3.35 
5.99 
3.63 
3.41 
1.47 
6.75 
3.60 
1.31 
4.60 
4.96 
4.27 
3.96 
3.55 
3.37 
1.53 
3.30 
2.13 
291 
7.11 
7.56 
4.80 
1.97 
2.00 
3.26 
July. 
In. 
4.92 
2.98 
4.75 
4.01 
2.91 
4.48 
4.21 
2.61 
2.54 
3.99 
3.20 
3.08 
.75 
3.32 
1.69 
6.93 
3.86 
2.45 
2.90 
5.58 
2.72 
3.24 
2.64 
5.08 
3.10 
3.09 
2.56 
4.01 
1.65 
2.51 
4.39 
3.56 
3.21 
2.54 
4.20 
2.02 
2.89 
4.53 
Aug. 
In. 
1.31 
3.41 
5.87 
1.49 
1.47 
2.58 
1.42 
2.14 
2.38 
2.64 
2.84 
2.77 
1.49 
2.14 
2.13 
1.23 
2.27 
3.80 
7.40 
2.17 
3.38 
4.35 
1.53 
3.86 
2.91 
2.62 
3.05 
3.71 
1.32 
3.19 
3.57 
2.58 
2.93 
1.19 
4.06 
1.21 
4.22 
3.39 
Sept. 
In. 
1.03 
1.91 
2.45 
1.71 
1.67 
1.34 
.97 
2.53 
2.36 
3.01 
.70 
1.03 
1.31 
1.32 
2.58 
.68 
1.66 
1.03 
4-52 
2.39 
.79 
3.36 
3.06 
1.97 
1.91 
2.41 
1.39 
1.20 
2.14 
2.51 
3.98 
2.81 
1.59 
2.45 
3.74 
2.27 
.41 
1.22 
Oct. 
Nov. 
Dec. 
In. 
In. 
In. 
4.05 
1.42 
0.76 
3.06 
.17 
.69 
2.83 
.43 
.97 
.56 
93 
.43 
1.40 
1.17 
.45 
1.45 
.42 
1.57 
1.26 
.28 
.21 
.07 
.43 
.89 
2.46 
.28 
.25 
1.59 
.85 
1.09 
.28 
1.06 
.25 
1.19 
.50 
1.05 
2.44 
.37 
.51 
.24 
1.41 
.21 
1.73 
2.33 
.40 
1.19 
.28 
.30 
2.18 
.46 
.29 
1.61 
.42 
.36 
2.78 
.55 
.33 
3.20 
.27 
.77 
2.65 
.44 
.62 
1.81 
.30 
.79 
2.00 
.11 
.75 
1.09 
1.82 
.17 
1.08 
1.93 
1.23 
1.07 
.18 
.45 
1.31 
1.34 
.58 
1.20 
.72 
1.52 
.61 
.50 
.43 
1.34 
1.01 
.54 
.56 
.14 
.70 
2.71 
.22 
.04 
1.62 
.43 
.38 
1.10 
.72 
.58 
.53 
.09 
1.29 
1.02 
.19 
.63 
1.22 
1.18 
1.04 
1.12 
1.82 
.57 
An- 
nual. 
In. 
27.36 
18.74 
25.26 
18.73 
18.80 
21.77 
17.09 
15.33 
20.26 
25.62 
20.97 
20.45 
19.32 
19.55 
27.20 
22.34 
19.80 
20.63 
23.78 
26. 02 
22.46 
21.77 
22.10 
26.92 
24.96 
18.48 
21.84 
22. 25 
12.21 
22.17 
22.63 
19.49 
24.22 
23.06 
27. 76 
13.41 
19.64 
23.02 
Note.— Figures show " weighted averages" for 1892 to 1919. Maximums shown in italics. 
The maximum annual precipitation over the whole watershed since 
1885 occurred in 1896. While slightly greater average annual pre- 
cipitation Was recorded at two observation stations for 1880 and 1882, 
and a much greater amount for 1878. than is shown for 1896, it is be- 
lieved the earlier records should not be taken to represent the aver- 
