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
80.8
94
87
72
76
77
February
92.4
95
86
99
88
97
March
94.3
95
89
97
91
97
April
95.3
93
96
94
100
May
96.6
95
100
99
99
June
97.2
96
100
98
97
July
97.4
99
99
94
99
August
96.6
95
97
94
99
September
93.7
96
92
93
99
October
93.7
94
94
94
94
November
82.6
91
87
80
81
December
81.2
89
65
75
78
Average
93.0
94.4
93.3
93.8
90.9
94.3
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.