condition mean min max 4 h after light 1018.415414 930.847441 1105.983387 8 h after light 994.823703 784.505379 1205.142027 12 h after light 1062.6003575 983.611855 1141.58886 4 h after dark 1291.538575 1105.770518 1477.306632 8 h after dark 978.3770039999999 656.090053 1300.663955 12 h after dark 932.238324 932.238324 932.238324