336 



H. MOHN. METEOROLOGY. i2ND arc. EXP. FraM 



PROBABILITY OF PRECIPITATION. DAILY PERIOD. 



The fourth column under each alternate hour in the Tables on pp. 

 238—327 shows the kind of precipitation occurring at the moment of 

 observation: rain (®), snow {^), sleet (®*), hail (a) and fog (=). The 

 following Table shows for each month, each observation-hour, and each 

 year, the number of cases in which rain, snow, sleet or hail have 

 been observed. To the right the column Total gives the sum of the 

 12 numbers for each year, and the column Days the numbers of 

 days of observation. The last row but one gives the sum-total of 

 numbers for each observation-hour, these sums, or total numbers of 

 cases of precipitation observed, divided by the total number of observa- 

 tions made being the Probability of precipitation, expressed in the last 

 row for each month as percentages, and headed p. c. The mean for 



the month stands in the same row under Total. 



* 



January. 



1899 



1900 

 I90I 

 1902 

 Slim 

 p. c. 



February. 



28 

 28 

 28 



March. 



10 



13 



31 



_^±_ 



68 



4.6 



31 

 31 

 31 

 3^ 

 124 



