Table 4 Monthly mean temperature correlated with square root transformed 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

0.1512

0.0770

0.0623

0.1389

malaria year-1; June

0.4407 **

0.5739 ***

0.4049 ***

0.3780 **

malaria year-1; July

0.4801 **

0.4511 ***

0.5081 ***

0.3275 **

malaria year-1; August

0.2428

0.1174

0.2610 *

0.1657

malaria year-1; September

-0.1479

0.0469

0.0824

0.0280

malaria year-1; October

0.1591

0.0322

0.1487

0,2145°

malaria year-1; November

0.1428

0.2048

0.0039

0.0137

malaria year-1; December

0.0190

0.0055

-0.1049

-0.1250