JanFebMarAprMayJunJulAugSepOctNovDec
111.42.712.913.3        
27.15.713.210.3        
35.39.212.98.8        
44.811.910.49.2        
53.311.011.69.2        
67.910.412.214.1        
710.610.111.813.2        
810.811.711.113.3        
96.611.312.313.5        
106.38.711.612.7        
118.310.512.710.9        
1210.510.210.410.2        
1311.911.811.110.5        
149.410.412.99.2        
1510.811.813.711.7        
1611.4 11.513.3        
176.612.310.416.2        
188.211.3 19.8        
199.811.4 22.9        
207.411.1 23.6        
217.412.6 22.3        
226.610.7          
237.013.2          
248.414.0          
2511.414.8          
2610.813.9          
278.314.9          
288.213.9          
296.4          
304.7          
315.514.3     
Avg: 8.2* 11.2* 12.1* 13.7        
Hi: 11.9* 14.9* 14.3* 23.6        
Lo: 3.3* 2.7* 10.4* 8.8        
Note:  *Incomplete dataset.
AvgJanFebMarAprMayJunJulAugSepOctNovDec
20198.2* 11.2* 12.1* 13.7        
201810.17.69.014.018.622.424.821.919.415.312.011.4
20178.710.112.514.417.420.421.620.518.016.211.79.6
201610.29.611.212.817.919.621.722.120.115.210.810.6
20159.98.411.115.215.819.920.619.918.115.313.413.3
20149.99.912.114.116.320.723.320.120.816.312.69.7
20138.17.17.511.515.118.623.822.019.016.410.410.4
201210.18.613.412.117.017.319.420.417.914.310.99.5
20117.410.511.917.416.418.620.019.719.116.913.810.5
20105.47.310.113.916.221.021.220.318.215.110.04.1
20097.18.312.014.217.120.019.720.319.116.012.57.5
200810.610.610.812.818.419.220.219.518.314.311.07.7
2007         * 15.311.99.4
Avg8.8* 9.1* 11.1* 13.816.919.821.520.618.9* 15.611.89.5