Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
84.5
86
98
100
71
February
79.9
74
91
100
74
March
88.2
73
91
50
85
April
93.9
95
100
100
May
97.8
97
100
100
99
June
96.0
91
98
100
99
July
95.0
95
96
100
94
August
94.2
78
87
100
98
September
94.9
94
93
100
95
October
93.7
91
94
100
95
November
98.8
89
100
100
December
88.8
95
97
0
Average
90.8
77.8
91.9
94.7
94.2
88.5
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.