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
81.2
93
82
84
63
88
February
91.4
93
87
97
85
99
March
92.7
93
90
98
90
99
April
94.9
91
97
94
100
May
95.7
98
99
95
97
June
97.7
99
98
97
95
July
97.2
100
96
94
99
August
97.0
96
97
92
99
September
96.8
100
98
94
98
October
93.2
90
98
95
92
November
85.4
91
89
87
87
December
86.3
86
55
84
90
Average
93.4
92.8
93.5
94.7
90.6
96.0
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.