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I I I I I I I I I I I I I I I 'I I I I Though some daily precipitation was eliminated primarily due to missing rawi nsonde data the vari ou s compari s ons werE~ not noti ceably affected since a revi ew of the raw data i ndi cated no parti cul a r' pattern to the occurrence of missing cases. Consequently, all frequency tables elll> 1 oyi ng the vari ous combi nati ons of rawi nsonde-deri ved parameters and precipitation categories utilize the matched rawinsonde and precipita- tion data. Tables 3-5 show frequencies for nine precip'itation measurement cate- gories of interest, stratified by the selected wet, normal and dry win- ters (in this case there was no matching with rawinsonde data). An examination of the event frequencies for each of the sites or station groups sel ected for study i ndi cated a number of promi nent di fferences summarized in the following: 1. The number of zero precipitation events (precentages account for differences in missing case counts) increased noticeably from wet to dry winters and from the Mogollon Rim locations to the southern mountains. 2. The number of cases within precipitation intervals for the wet winter exceeded those for the respective dry winter categories with increasing counts as precipitation amounts increased. The greater differences (percentage) occurred in the interval where precipitation events exceeded 0.8 inch of water equivalent. Oifferences were least with events of 0.05 inch or less. 3. In the dry year with the Mogollon Rim station groups, there occurred about 35-40 events with precipitation amount ~ 0.2 inch and about 10 events with amounts> 0.2 and < 0.8 inch. In the wet winter the respective event numbers were 50-55 and 25. The counts were somewhat less by about 40 percent in the Mule and Chiricahua Mountains. Since precipitation elll>loyed in these frequency tables was not matched with rawinsonde data, a few more cases were available f or ana ly ses . 32