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
94.2
92
92
98
91
94
February
89.7
80
92
95
82
98
March
80.8
80
89
65
90
80
April
80.6
57
58
85
97
May
85.8
74
89
94
82
June
90.3
85
95
83
87
July
95.6
96
97
91
98
August
95.7
94
88
96
95
September
94.4
95
90
89
98
October
97.5
97
97
99
99
November
92.3
87
90
90
98
December
93.3
97
94
92
92
Average
90.0
83.9
90.3
87.3
90.3
92.7
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.