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
86.5
92
92
91
77
84
February
93.2
88
99
92
90
92
March
94.2
93
94
95
97
92
April
94.0
90
97
94
95
May
92.4
97
93
89
92
June
90.9
93
95
87
89
July
86.9
90
89
86
85
August
82.5
89
76
81
76
September
90.3
93
94
94
94
October
87.7
88
81
85
88
November
88.9
85
83
93
96
December
88.2
96
89
87
86
Average
89.7
91.0
92.1
89.6
88.1
88.8
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.