Table 3.
Mean and standard deviation (sd) of surface temperatures collected in the morning (a) and afternoon (b) during the field campaign between June 6 and July 27, 2018 (N = 1003); percent of values above 1-min and 5-s skin burn threshold; mean values for sun and shade and mean difference for measured materials
| Type of material/object | Metal bench (powder-coated metal) | Concrete | Dirt/gravel | Asphalt | Grass |
|---|---|---|---|---|---|
| (a) Morning | |||||
| All locations mean (sd), [°C] | 34.4 (0.5) | 35.3 (0.4) | 34.9 (0.6) | 39.6 (1.7) | 31.9 (0.8) |
| Sun locations mean (sd), [°C] | 37.9 (1.1) | 38.3 (4.5) | 39.4 (0.8) | 39.6 (1.7) | 34.9 (1.3) |
| Shade locations mean (sd), [°C] | 33.0 (0.3) | 32.9 (0.3) | 31.1 (0.4) | N/A | 29.2 (0.8) |
| Sun-Shade difference, [°C] | 4.9 | 5.4 | 8.3 | N/A | 5.7 |
| Values above 1-min skin burn, [%] | 0 | 0 | 0 | 0 | N/A |
| Values above 5-s skin burn, [%] | 0 | 0 | 0 | 0 | N/A |
| (b) Afternoon | |||||
| All locations mean (sd), [°C] | 42.2 (0.4) | 47.8 (0.6) | 51.3 (0.7) | 59.8 (0.8) | 43.1 (1.2) |
| Sun locations mean (sd), [°C] | 47.7 (1.0) | 57.4 (0.5) | 60.4 (0.7) | 59.8 (0.8) | 50.1 (1.6) |
| Shade locations mean (sd), [°C] | 40.4 (2.5) | 41.3 (0.5) | 44.3 (0.6) | N/A | 36.0 (0.7) |
| Sun-Shade difference, [°C] | 7.3 | 16.1 | 16.1 | N/A | 14.1 |
| Values above 1-min skin burn, [%] | 7.9 | 33.6 | 37.9 | 83.3 | N/A |
| Values above 5-s skin burn, [%] | 0.7 | 18.3 | 24.7 | 44.4 | N/A |