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
78.3
87
76
81
58
80
February
84.6
84
91
79
82
96
March
86.2
68
87
99
87
91
April
94.3
88
94
95
98
May
94.4
100
98
90
95
June
97.4
100
98
94
99
July
97.2
97
98
98
96
August
94.0
87
96
90
98
September
91.0
95
94
90
88
October
84.6
88
88
87
76
November
65.0
41
49
80
84
December
70.4
64
68
85
65
Average
88.8
77.3
89.2
92.0
89.3
91.8
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.