Table 4. Correlations between fire weather season length metrics and reported nationwide burned area.
| Country | Time period | Fire weather season length | Long fire weather season affected area |
|---|---|---|---|
| Canada68 | 1979–2013 | 0.30* (34) | 0.324*NS (34) |
| United States44 | 1979–2013 | 0.679*** (21) | 0.663*** (21) |
| United States44 | 1992–2013 | 0.683*** (34) | 0.715*** (34) |
| Spain69 | 1980–2013 | 0.703*** (33) | 0.743*** (27) |
| Portugal69 | 1980–2013 | 0.659*** (33) | 0.67*** (19) |
| Italy69 | 1980–2013 | 0.823*** (33) | 0.772*** (27) |
| France69 | 1980–2013 | 0.469*** (33) | NS |
| Greece69 | 1980–2013 | 0.611*** (33) | NS |
| Latvia69 | 1980–2013 | 0.694*** (33) | 0.845** (10) |
NS, not significant.
Spearman's rank-order correlation between detrended fire weather season length, long fire weather season affected area and log-transformed national burned area data reported for two countries in North America and six countries in Europe (***P<0.01, **P<0.05, *P<0.1). Canadian burned area was limited to boreal forests where most of the burned area occurs70. Number of data points after detrending are reported in parentheses.