VALLEY OF THE MINNESOTA RIVER. 577 
Through the kindness of Director Harmon of the Minnesota 
Weather Service. I have been able to compile from records pre- 
served on file in his office at Minneapolis the following tables 
of precipitation and temperature of three important points in 
the valley of the Minnesota. St. Paul is near the mouth of the 
main stream. Mankato is in the southern central region. 
Morris is in the northwestern region. Thus the points are 
fairly illustrative. The figures represent averages of monthly 
means and summations of averages for the average yearly 
mean. The period covered by the observations is six years. 
TABLE OF PRECIPITATION. 
1886-1891. | Jan. | Feb. |Mar. | Apr.| May |JunejJuly |Aug. |Sept.| Oct. |Nov. | Dec.| Year 
Morris ....) .85 | .88 | .81 ; 1.55 | 1.81 | 4.00 | 4.12 | 2.48 
st. Paul...] 1.13 | .64) .93 | 2.76 | 2.50 | 3.25 | 2.98 | 3.22 
Mankato..| 1.46 | 1.05 | 1.16 | 2.80 | 2.94 | 2.74 | 2.91 | 1.87 
2.58 | 1.09 | .38 | 1.03 | 20 53 
2.29 | 1.29 | .90 | 1.81 | 23.20 
2: 1.06 | 1.00 | 1.82 | 23.04 
Morris: lat. 45° 80’; long. 95° 58’; alt. 1,129 feet. 
St. Paul: lat. £4° 58’; long. 93° 03’; alt. 693 feet. 
Mankato: lat. 44° 06’; long. 94° 01’; alt. 791 feet. 
TABLE OF TEMPERATURE. 
] 
1886-1891. | Jan.| Feb. } Mar.} Apr. Mag ielindy Aug.jSept.| Oct. |Nov.| Dec. |Year 
Morris ....| 6.91 | 7.03 122.76 |44.76 155.23 /66.58 |69.93 |66.36 |58.16 j44.18 j27.0 [16.75 | 40.47 
St. Paul.../10.85 |12.68 /25.48 }46.22 156 45 |66.96 /71.28 /67:38 |58.98 [46.25 (29.91 [21.55 | 42.83 
Mankato..|11 52 [14.75 [27.61 |48.28 [56.90 88.47 72.12 67.40 159.88 |47.15 131.66 [23.71 | 44.12 
From these tables it is seen that the range of temperature 
is somewhat higher in the eastern than in the western portion 
of the valley and somewhat higher, too, in the southern than in 
the northern. The precipitation is greater in the north- 
eastern corner than elsewhere. This is. however, the prin- 
cipal position of the forest area of the valley. It is probable 
that forest and rainfall have a reciprocal influence upon each 
other. 
So far as the data of prevailing winds have been examined 
it is impossible to make any valuable generalisations from them 
except that the shape of the valley produces some diversions in 
different portions. What these diversions are or what law 
governs them, I am unable to say. 
Average cloudiness is unfortunately not a matter of record 
to such an extent that anything can be done with it. 
—37 
