JanFebMarAprMayJunJulAugSepOctNovDec
111.42.712.913.314.720.8      
27.15.713.210.313.818.9      
35.39.212.98.816.519.3      
44.811.910.49.212.916.4      
53.311.011.69.212.817.1      
67.910.412.214.113.116.7      
710.610.111.813.213.817.1      
810.811.711.113.313.917.9      
96.611.312.313.514.116.8      
106.38.711.612.715.116.8      
118.310.512.710.916.912.6      
1210.510.210.410.216.315.3      
1311.911.811.110.515.015.8      
149.410.412.99.216.917.9      
1510.811.813.711.717.018.4      
1611.4 11.513.316.6       
176.612.310.416.213.1       
188.211.3 19.815.9       
199.811.4 22.918.6       
207.411.113.623.619.1       
217.412.613.522.319.6       
226.610.711.518.819.0       
237.013.212.218.718.4       
248.414.013.313.119.1       
2511.414.813.513.220.6       
2610.813.914.413.519.6       
278.314.915.012.718.0       
288.213.915.413.017.3       
296.414.013.817.6       
304.717.013.821.6       
315.514.318.4    
Avg: 8.2* 11.2* 12.814.016.6* 17.2      
Hi: 11.9* 14.9* 17.023.621.6* 20.8      
Lo: 3.3* 2.7* 10.48.812.8* 12.6      
Note:  *Incomplete dataset.
AvgJanFebMarAprMayJunJulAugSepOctNovDec
20198.2* 11.2* 12.814.016.6* 17.2      
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* 11.213.916.9* 19.621.520.618.9* 15.611.89.5