Table 2.
Comparisons of mean January temperatures and average January minimum temperatures between catch basins, external controls and weather stations of six locations south and north of the Alps
| Location | Catch basins | External controls | Weather station | Catch basins vs weather station | External controls vs weather station | Catch basins vs weather station |
|---|---|---|---|---|---|---|
| Mann-Whitney U | Mann-Whitney U | Spearman’s correlation | ||||
| Mean January temperatures ± SD (°C)a | ||||||
| Cadenazzo | -1.12 ± 1.46 | 0.34 ± 2.21 | 0.84 ± 1.82 | 569.5* | 409.0 | 0.685* |
| Chiasso | -1.09 ± 1.03 | -0.27 ± 2.10 | -0.38 ± 2.20 | 708.5 | 421.0 | 0.846* |
| Stabio | -0.61 ± 1.75 | -0.13 ± 1.76 | -0.75 ± 2.34 | 4155.5 | 1213.0 | 0.853* |
| Basel | 1.62 ± 1.77 | -0.26 ± 2.67 | -1.68 ± 3.42 | 1847.0* | 342.0 | 0.896* |
| Geneva | 3.60 ± 2.37 | 2.57 ± 2.88 | -1.15 ± 2.40 | 859.0* | 753.0* | 0.925* |
| Zurich | 0.09 ± 1.74 | -1.55 ± 3.01 | -1.43 ± 3.41 | 2259.5* | 1915.0 | 0.856* |
| Mean January minimum temperatures ± SD (°C)a | ||||||
| Cadenazzo | -1.92 ± 1.39 | -2.24 ± 1.93 | -3.56 ± 2.09 | 728.0* | 287.0* | 0.760* |
| Chiasso | -1.94 ± 1.28 | -4.54 ± 2.41 | -5.59 ± 2.36 | 179.0* | 322.0 | 0.837* |
| Stabio | -2.21 ± 1.70 | -2.88 ± 1.84 | -6.02 ± 2.73 | 1062.0* | 468.0* | 0.897* |
| Basel | 0.98 ± 1.81 | -1.65 ± 2.68 | -4.47 ± 3.62 | 981.0* | 241.0* | 0.866* |
| Geneva | 2.42 ± 2.46 | 0.71 ± 3.19 | -3.95 ± 2.07 | 300.0* | 322.0* | 0.610* |
| Zurich | -0.89 ± 1.79 | -3.66 ± 3.15 | -3.42 ± 3.28 | 1461.0* | 1853.0 | 0.899* |
aBased on temperature data recorded in January 2017
*Significant Mann-Whitney U outcomes and significant Spearman’s rank correlations coefficients
Abbreviation: SD standard deviation