1040 Year Mean, mb 
- x—x 1991 1015.7 
3 @----0 1983-91 1015.9 
Atmospheric Pressure, mb 
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 
Month 
Figure 4. Daily barometric pressure values with monthly means 
15 cm and 1.0 percent for amounts greater than 15 cm. 
21. The rain gage was inspected daily, and the analog chart recorder 
was maintained by procedures similar to those for the microbarograph. 
22. Plastic rain gage. An Edwards Manufacturing Company (Alberta Lea, 
MN) True Check 15-cm-capacity clear plastic rain gage with a 0.025-cm resolu- 
tion was used to monitor the performance of the weighing rain gage. This gage 
was located near the weighing gage, and the gages were compared on a daily 
basis. Very few discrepancies were identified during the year. 
Results 
23. Daily and monthly average precipitation values are shown in 
Figure 5. Statistics of total precipitation for each month during this year 
and average totals for all years combined are presented in Table 2. 
13 
