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
69.2
82
59
90
67
81
February
82.4
89
91
98
67
97
March
88.8
89
94
95
82
93
April
95.7
94
97
94
100
May
97.5
99
100
98
99
June
97.5
99
100
98
95
July
99.3
100
100
99
99
August
99.4
100
100
98
99
September
98.8
100
97
100
98
October
91.2
99
100
92
84
November
72.7
93
74
82
76
December
59.7
77
46
50
38
Average
89.4
86.8
93.2
94.2
88.0
90.3
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.