Table 3 Monthly mean temperature correlated with malaria cases in 1800–1870.

Helsinki 1830–1870

41 years

Tornedalen 1818–1870

53 years

Stockholm 1800–1870

71 years

St. Petersburg 1806–1870

65 years

malaria year-1; May

0.1487

0.0269

0.0511

0.1338

malaria year-1; June

0.4301 **

0.5289 ***

0.3372 **

0.3587 **

malaria year-1; July

0.4628 **

0.4135 **

0.4543 ***

0.2888 *

malaria year-1; August

0.2672°

0.1570

0.2740 *

0.1793

malaria year-1; September

0.1156

0.0655

0.0637

0.0678

malaria year-1; October

0.1566

0.0200

0.1326

0.2657 *

malaria year-1; November

0.1462

0.1958

0.0000

0.0220

malaria year-1; December

0.0037

-0.002

-0.1144

-0.1221