JanFebMarAprMayJunJulAugSepOctNovDec
111.93.6          
27.87.5          
37.48.1          
48.59.3          
57.48.7          
610.911.9          
711.811.8          
812.411.2          
97.312.9          
107.58.3          
1110.312.3          
1211.212.8          
1312.712.3          
1411.416.8          
159.916.4          
1610.112.9          
177.915.8          
187.111.3          
195.8           
2010.2           
219.1           
228.8           
233.8           
245.8           
2512.3           
2611.1           
278.8           
289.4           
297.2          
308.5          
318.6      
Avg: 9.1* 11.3          
Hi: 12.7* 16.8          
Lo: 3.8* 3.6          
Note:  *Incomplete dataset.
AvgJanFebMarAprMayJunJulAugSepOctNovDec
20199.1* 11.3          
201810.28.610.816.823.926.629.925.822.418.812.611.4
20178.911.015.618.321.325.625.324.520.818.212.49.5
201610.210.912.715.621.522.425.926.624.017.611.910.9
20159.69.513.618.920.124.224.923.921.117.514.014.1
201410.411.516.318.920.025.429.024.124.519.213.310.3
20137.47.88.415.518.522.229.226.521.618.311.8* 10.5
201210.710.117.515.720.521.023.325.322.616.312.09.5
20118.511.014.323.121.223.024.624.123.720.014.410.4
2010 9.213.319.020.125.826.623.521.717.210.24.7
Avg9.5* 10.113.618.020.824.026.524.922.518.112.5* 10.2