Table 4 User-relevant indices of climate in 2000–2009 with mean counterfactual climate condition and factual climate condition, differences between factual and counterfactual climate simulations (relative differences for all indices except for mean temperature and onset day). All values are shown on average across West Africa (20°W to 15°E; 4°N to 18°N). One (two) star(s) indicates that the difference in the ensemble mean is significant at the 1% (0.1) level. The three columns on the right indicate the number of the 100 runs that pass a Student’s test or a Kolmogorov test, which agree with the sign of the difference of the ensemble mean at the 5% significance level.

From: Evidence of crop production losses in West Africa due to historical global warming in two crop models

User-relevant Indices Counterfactual Factual Difference Student t-Test KS Test Sign Agreement
Annual Mean Temperature 26.9 28.0 1.0** 100 100 100
Annual Rainfall 974.8 983.9 0.9% 1 0 62
Annual Rainy Days 82.1 82.6 0.7%* 0 0 64
Heavy Rainfall Events 6.8 7.6 11.6%** 32 10 99
Very Heavy Rainfall Events 1.7 2.2 27.7%** 85 43 100
Rainfall Intensity 14.4 15.0 3.9%** 25 11 94
Very Hot Days 0.0 0.1 841.0%** 82 83 100
Onset Day 160.2 160.8 0.6* 1 0 66