JanFebMarAprMayJunJulAugSepOctNovDec
112.37.3          
25.39.4          
35.611.2          
412.310.3          
512.810.6          
67.59.7          
77.14.7          
83.25.6          
95.37.3          
104.84.2          
116.3           
125.2           
137.0           
1411.6           
1512.2           
169.6           
176.0           
185.1           
193.5           
207.4           
216.3           
226.1           
2310.7           
2411.3           
257.4           
2610.2           
279.6           
2810.3           
297.9          
308.9          
3110.3      
Avg: 8.0* 8.0          
Hi: 12.8* 11.2          
Lo: 3.2* 4.2          
Note:  *Incomplete dataset.
AvgJanFebMarAprMayJunJulAugSepOctNovDec
20258.0* 8.0          
20248.712.013.215.119.321.422.623.219.416.511.810.1
20239.211.111.614.720.024.721.522.023.217.612.111.0
20229.411.613.716.319.222.025.826.720.518.613.68.3
20217.69.612.714.216.421.923.721.722.117.111.810.7
20209.911.012.218.320.621.322.724.221.215.313.38.7
20197.911.613.116.418.620.925.123.420.515.310.610.2
201810.07.79.915.121.023.927.523.420.316.312.410.8
2017* 8.710.414.215.919.122.423.021.718.616.811.89.4
201610.210.111.914.019.520.923.224.121.616.711.610.8
20159.98.912.217.117.321.622.321.319.416.313.813.8
201410.310.914.316.518.923.626.722.221.9* 16.912.810.1
20137.77.58.114.017.821.627.924.720.217.010.810.6
2012     * 20.521.423.219.714.411.210.0
Avg* 9.0* 10.012.315.619.0* 22.024.123.220.7* 16.512.110.3