Spreadsheet: 106899d1304033149-need-to-create-a-monthly-average-for-daily-values-for-thousands-of-rows-test-1-
Sheet: Monthly

Date | Average Value
'1899.01 | 62.24409090909091
'1899.02 | 64.37899999999999
'1899.03 | 70.53130434782608
'1899.04 | 75.68799999999999
'1899.05 | 71.66347826086958
'1899.06 | 70.6690909090909
'1899.07 | 71.81142857142858
'1899.08 | 75.26565217391304
'1899.09 | 74.27380952380952
'1899.10 | 73.21818181818183
'1899.11 | 75.1640909090909
'1899.12 | 65.48952380952382
'1900.01 | 65.2440909090909
'1900.02 | 66.675
'1900.03 | 62.96227272727273
'1900.04 | 63.75100000000001
'1900.05 | 59.28045454545454
'1900.06 | 56.55380952380953
'1900.07 | 56.27857142857142
'1900.08 | 58.04869565217392
'1900.09 | 57.67315789473684
'1900.10 | 55.95782608695653
'1900.11 | 63.20849999999999
'1900.12 | 66.16947368421053
'1901.01 | 68.42409090909092
'1901.02 | 67.24777777777778
'1901.03 | 68.31095238095239
'1901.04 | 69.78380952380951
'1901.05 | 74.07045454545455
'1901.06 | 73.90849999999999
'1901.07 | 76.89999999999999
'1901.08 | 71.34272727272729
'1901.09 | 71.82631578947368
'1901.10 | 68.8513043478261
'1901.11 | 64.9957894736842
'1901.12 | 65.42714285714287
'1902.01 | 63.05227272727271
'1902.02 | 63.91789473684211
'1902.03 | 64.9815
'1902.04 | 65.89
'1902.05 | 66.92999999999999
'1902.06 | 66.17095238095239
'1902.07 | 65.36454545454546
'1902.08 | 65.42095238095236
'1902.09 | 66.1952380952381
'1902.10 | 66.41217391304347
'1902.11 | 65.51555555555557
'1902.12 | 63.24636363636364
'1903.01 | 61.59333333333333
'1903.02 | 65.0022222222222
'1903.03 | 66.50909090909092
'1903.04 | 64.82250000000002
'1903.05 | 63.04619047619047
'1903.06 | 62.81863636363637
'1903.07 | 58.19999999999999
'1903.08 | 54.58714285714285
'1903.09 | 50.9004761904762
'1903.10 | 49.92227272727273
'1903.11 | 45.06578947368421
'1903.12 | 44.07227272727273
'1904.01 | 46.6615
'1904.02 | 48.39736842105263
'1904.03 | 48.2208695652174
'1904.04 | 47.77699999999999
'1904.05 | 49.16428571428572
'1904.06 | 48.19409090909091
'1904.07 | 48.76350000000001
'1904.08 | 51.31043478260869
'1904.09 | 53.50047619047618
'1904.10 | 56.10047619047621
'1904.11 | 60.14150000000001
'1904.12 | 67.44142857142856
'1905.01 | 69.34285714285713
'1905.02 | 70.20666666666668
'1905.03 | 72.8186956521739
'1905.04 | 77.32526315789474
'1905.05 | 81.4240909090909
'1905.06 | 75.39181818181818
'1905.07 | 74.30850000000001
'1905.08 | 78.9404347826087
'1905.09 | 82.12049999999998
'1905.10 | 80.64045454545455
'1905.11 | 81.944
'1905.12 | 83.51849999999999
'1906.01 | 93.24227272727272
'1906.02 | 99.27444444444444
'1906.03 | 99.19818181818181
'1906.04 | 95.00809523809522
'1906.05 | 95.54818181818182
'1906.06 | 91.66666666666667
'1906.07 | 92.64190476190477
'1906.08 | 87.93913043478261
'1906.09 | 93.60421052631578
'1906.10 | 94.86739130434783
'1906.11 | 95.3435
'1906.12 | 94.1545
'1907.01 | 94.60909090909087
'1907.02 | 94.75666666666667
'1907.03 | 91.91476190476189
'1907.04 | 83.2968181818182
'1907.05 | 83.34727272727272
'1907.06 | 82.37249999999999
'1907.07 | 78.55954545454546
'1907.08 | 81.00999999999999
'1907.09 | 72.8435
'1907.10 | 70.57739130434781
'1907.11 | 63.12421052631579
'1907.12 | 55.73952380952381
'1908.01 | 58.55454545454545
'1908.02 | 62.56315789473685
'1908.03 | 60.43318181818183
'1908.04 | 64.8757142857143
'1908.05 | 68.36571428571428
'1908.06 | 72.2959090909091
'1908.07 | 72.95739130434784
'1908.08 | 76.76142857142857
'1908.09 | 82.71714285714286
'1908.10 | 81.39045454545455
'1908.11 | 81.34631578947368
'1908.12 | 86.1577272727273
'1909.01 | 86.081
'1909.02 | 85.38777777777779
'1909.03 | 84.58000000000001
'1909.04 | 82.68999999999998
'1909.05 | 87.07650000000001
'1909.06 | 90.45818181818184
'1909.07 | 92.50238095238095
'1909.08 | 93.61818181818181
'1909.09 | 98.07
'1909.10 | 98.19050000000001
'1909.11 | 98.4075
'1909.12 | 98.8378260869565