336 



TRANSACTIONS OF THE 



Table No. 4 — Weather Summary at Oroville, Butte County, Califor- 

 nia, for 1884, 1885, and 1886, and January and February, 1887. 



The following table shows the mean, maximum, and minimum temper- 

 ature by years 1884, 1885, 1886, and January and February, 1887. Also, 

 the maximum and minimum temperature, number of clear, cloudy, fair, 

 foggy, and rainy days, and frosts. Also, mean temperature by seasons — 

 Winter, Spring, Summer, and Autumn — years 1884, 1885, 1886: 



L884. 



1885. 



1886. 



January, 



1887. 



Febr'y, 

 1887. 



Average — 



(2 months) 



January and 



Feb'y,1887. 



Annual mean temperature 



Annual mean maximum temperature. 

 Annual mean minimum temperature. 



Maximum temperature 



Minimum temperature. 



Rainfall... 



Number clear days 



Number fair days 



Number cloudy days 



Number foggy days 



Number rainy days 



Number light frosts 



Number heavy frosts 



Number killing frosts 



64.61 

 84.62 

 44.61 

 102.00 

 25.00 

 13-73 

 *78 

 *10 

 *33 

 *2 

 20 

 5 

 8 

 4 



t 



Mean temperature, Winter. .. 

 Mean temperature. Spring _.. 

 Mean temperature, Summer . 

 Mean temperature, Autumn . 



51.152 

 63.811 



78.21 



62.22 



50.78 

 60.22 

 42.17 

 70.00 

 32.00 

 1-03 

 23 

 2 



5 

 none 

 4 

 4 

 3 

 none 



47.03 

 53.16 

 41.03 

 70.00 

 32.00 

 8-93 

 15 

 

 13 

 none 

 13 

 2 



1 



3 



48.901 

 56.69 

 41.60 

 70.00 

 32.00 

 4-96 

 19 



1 



9 







8.1 



3 



2 



1.5 



52.90 

 64.49 

 78.80 

 64.28 



* The record of clear, fair, cloudy, and foggy days for 1884 covers hut four months. 



Oroville Weather for January. 



The following table shows the mean daily temperature, the highest and 

 lowest temperature, and the mean of the highest and lowest, for the month 

 of January, 1886: 



Total rainfall, 5.17 inches. 



