Change {%) between two multi-decadai averages during 2™*half of 20th Century
Fd annual anomalies
1950 1955 I 960 1965 1970 1975 1980 1985 1990 1995
Trend significant at 95% level of confidence (using weighted linear regression analysis)
Figure 5. Changes in the number of frost days during the second half of the 20th century. The upper panel shows percentage changes in the total number of frost days, days with a minimum temperature of less than 0 °C, between the first and second half of the period 1946-1999. The size of each circle reflects the size of the change it represents. The lower panel shows the average annual numbers of frost days as percentage differences from the 1961-1990 average value. The trend shown is statistically significant at the 5% level. The analysis shown is from Frich et al. 2000.
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