310 



TRANSACTIONS OF THE 



Commencing on the nineteenth of August and ending on September 

 twelfth was the longest continuous spell of hot weather I have ever expe- 

 rienced. On the tenth and eleventh of September shows a higher daily 

 mean temperature than in any other days of the present year — 88.5° and 89°; 

 the highest for these two days, 103.5°, 102°; lowest, 78° and 77.5°. On these 

 two days the air was close and oppressive. Most people believe the temper- 

 ature was higher than recorded. During the twenty-four days of this hot 

 wave no time was the temperature below 90° at the 2 and 4 p. m. readings. 

 The highest barometer was 30.00; lowest, 29.62; mean, 29.842; clear days, 

 25; cloudy, 2; fair, 3; days it rained, 3; trace, 1. Rainfall for the month, 

 .63 of an inch, and the season to date, .70. Prevailing winds, southerly. 

 At 6 a. m. on the fourteenth a light thunder and lightning shower of rain 

 occurred. Its course was from north to south; precipitation, .04 of an inch. 

 Also on the fifteenth three distinct thunder and lightning showers of rain. 

 The one at 1 p. m. was the most severe; the peals of thunder were loud, 

 and the flashes of lightning sharp, forked, and zigzag. Its course was 

 from southeast to northwest; precipitation. .48 of an inch. Also one on 

 the twenty-second passed east of town; course, north and south; precipi- 

 tation, trace. 



Summary for September, 1884 to 1888, at Oroville. 



Tear: 



1884. 



1885. 



1886. 



1S87. 



1888. 



Average. 



Mean temperature.. 

 Highest temperature 

 Lowest temperature. 



Clear days 



Cloudy days 



Fair days 



Rainfall-.- 



Season to date 



Light frost 



72.73 



97.00 



54.00 



21 



7 



2 



2.27 



2.27 



' 



69.25 



94.00 



52.00 



21 



6 



4 



.20 



.20 







74.19 



96.00 



54.00 



30 











.00 



.00 







75.25 



96.00 



53.00 



20 







4 



.15 



.16 







80.00 



102.00 



57.00 



25 



2 



3 



.63 



.70 







74.28 



97.00 



54.00 



25.2 



3 



2.3 



0.65 



0.67 







October, 1888 — Was one of the most pleasant and delightful months we 

 have had for years, and at no time was the maximum temperature above 

 89°, and the minimum but five days below 50°. No rain or a trace fell this 

 month. This has been the only October for five years I have not recorded 

 a measure or trace. The mean temperature was 68°, nearly 2° above the 

 average. Highest was 89°; lowest, 45°. Highest barometer, 30.12; lowest, 

 29.73; mean, 29.91. Number clear days, 30; cloudy, none; fair, 1. Rainfall, 

 none; season to date, .70 of an inch. Prevailing winds, southerly. No frost 

 this month. This mild and favorable October weather caused the oranges 

 to commence coloring nicely, and before November expired many carloads 

 were in condition for shipping. 



Summary for October, I884 to 1888, at Oroville. 



Tear: 



1S84. 



1885. 



1S86. 



1887. 



1888. 



Average. 



Mean temperature . 

 Highest temperature 

 Lowest temperature- 

 Clear days 



Cloudy days 



Fair days 



Rainfall . 



Season to date 



Light frost 



64.31 



87.00 



46.00 



21 



7 



2 



2.0S 



4.35 







69.28 



94.00 



52.00 



20 



6 



2 



.00 



.20 







63.22 



87.00 



43.00 



25 



5 



1 



.63 



.63 







68.40 



91.00 



45.00 



29 







2 



.00 



.16 







68.00 



89.00 



45.00 



30 







1 



.00 



.70 







66.62 



89.30 



46.10 



25 



2.20 



2 



.54 



1.21 







