SOLAR SURFACE FROM 1908 TO 1920 
125 
Average number of 
Months 
Groups 
1 Spots jFaculae 
1908 
January 
3.3 
13.3 
3.3 
February 
2.3 
6.4 
3.4 
March 
2.7 
8.0 
3.1 
April 
3.9 
15.5 
2.8 
May 
3.1 
9.1 
3.0 
June 
3.3 
12.6 
3.1 
July 
3.1 
12.8 
3i.4 
August 
4.5 
22.5 
4.4 
September 
5.4 
22.6 
■ 3.8 
October 
2.4 
6.0 
4.0 
November 
3.3 
14.4 
3.2 
December 
3.3 
12.5 
3.3 
1 
1909 
January 
4.6 
18.8 
3.3 
February 
4.0 
21.2 
3.7 
March 
3.3 
. 20.0 
3.6 
April 
1.8 
6.8 
2.4 
May 
2.3 
11.5 
2.4 
June 
2.4 
.7.4 
1 2.8 
July 
2.5 
10.2 
2.5 
August 
2.3 
8.0 
3.0 
September 
2.2 
10.1 
2.5 
October 
4.1 
14.0 
3.3 
November 
December 
1910 
January 
2.0 
4.0 
3.0 
February 
1.6 
10.0 
1.8 
March 
2.0 
7.1 
2.0 
April 
0.8 
1.4 
1.0 
May 
1.7 
6.2 
1.9 
June 
1.0 
3.7 
1.6 
July 
1.1 
3.1 
1.8 
August 
0.8 
2.9 
2.0 
September 
2.0 
7.0 
2.0 
October 
2.0 
11.3 
2.0 
November 
0.4 
0.8 
2.0 
December 
■0.4 
2.0 
1 
1.2 
1911 
1 
January 
0.5 
0.5 
1.1 
February 
0.8 
2.3 
1.4 
March 
0.8 
3.3 
1.0 
April 
1.2 
2.6 
1.2 
May 
0.8 
3.0 
1.6 
June 
0.4 
1.0 
1.0 
July 
0.5 
2.0 
1.0 
August 
0.7 
1.4 
1.1 
September 
0.6 
1.5 
0.7 
October 
0.3 
0.8 
0.8 
November 
0.6 
1.0 
0.5 
December 
0.3 
0.3 
I 
0.9 
1912 
1 
January 
0.0 
0.0 
0.2 
February 
0.1 
0.1 
0.3 
March 
0.4 
1.5 
0.5 
April 
0.6 
3.8 
0.5 
May 
0.4 
3.1 
0.5 
Average number of 
Months 
Groups 
Spots 
Faculae 
June 
1 0.9 
0.9 
1.1 
July 
0.4 
2.3 
1.0 
August 
0.1 
0.1 
0.4 
September 
0.5 
4.5 
1.4 
October 
0.3 
1.7 
1.1 
November 
0.2 
0.4 
0.5 
December 
0.4 
2.8 
0.6 
1913 
January 
0.3 
0.5 
0.6 
February 
0.1 
0.3 
0.2 
March 
0.0 
0.0 
0.0 
April 
0.2 
0.8 
0.2 
May 
0.0 
0.0 
0.1 
June 
0.0 
0.0 
0.0 
July 
0.1 
0.3 
0.2 
August 
0.0 
0.0 
0.7 
September 
0.2 
1.0 
0.3 
October 
0.2 
1.5 
0.2 
November 
0.1 . 
0.3 
0.3 
Decemiber 
0.5 
2.5 
0.8 
1914 ■ 
January 
0.0 
0.0 
1.2 
February 
0.3 
1.5 
0.5 
March 
0.3 
0.6 
0.7 
April 
1.0 
4.1 
1.1 
May 
0.6 
2.6 
1.6 
June 
0,7 
4.9 
1.4 
July , 
0.7 
1.8 
1.3 
August 
0.8 
3.0 
1.1 
September 
1.9 
3.7 
1.8 
October 
0.8 
3.4 
1.7 
November 
1.7 
9.9 
2.3 
December 
2.6 
6.7 
2.3 
1915 
January 
1.7 
6.8 
3.2 
February 
3.8 
21.5 
3.6 
March 
1.7 
5.3 
3.3 
April 
2.8 
18.7 
3.6 
May 
1.2 
6.4 
3.0 
June 
4.3 
36.4 
2.9 
July 
3.5 
18.3 
4.2 
August 
4.3 
20.6 
4.0 
September 
3.0 
17.6 
4.6 
October 
3.9 
22.8 
3.7 
November 
3.6 
13.2 
3.8 
December 
2.5 
9.1 
4.0 
1916 
January 
3.5 
18.7 
3.4 
February 
6.0 
15.7 
3.0 
March 
5.0 
31.2 
3.8 
April 
4.4 
28.8 
4.6 
May 
5.8 
28.0 
4.2 
June 
5.3 
34.7 
4.0 
July 
3.3 
12.0 
3.3 
August 
2.0 
7.0 
4.0 
September 
3.2 
14.5 
3.3 
October 
, 5.5 
15.7 
4.0 
November 
4.1 
24.6 
4.9 
December 
5.5 
29.5 
4.0 
