JanFebMarAprMayJunJulAugSepOctNovDec
11.5           
23.6           
34.3           
45.2           
54.1           
63.7           
73.8           
83.8           
91.7           
104.7           
119.9           
1210.9           
1311.0           
1410.5           
157.3           
1610.6           
177.4           
1810.7           
19            
20            
21            
22            
23            
24            
25            
26            
27            
28            
29           
30           
31       
Avg: * 6.4           
Hi: * 11.0           
Lo: * 1.5           
Note:  *Incomplete dataset.
AvgJanFebMarAprMayJunJulAugSepOctNovDec
2021* 6.4           
202010.111.111.616.418.819.921.222.319.814.712.89.4
20198.2* 11.2* 12.814.016.619.222.721.719.414.910.810.5
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
Avg* 8.7* 9.2* 11.214.017.019.821.620.819.0* 15.411.89.5