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
92.7
97
91
98
79
95
February
95.1
97
89
98
98
96
March
95.6
100
98
91
93
98
April
95.0
97
91
100
98
May
93.2
98
92
94
93
June
90.5
88
86
92
91
July
97.1
99
99
95
94
August
93.7
96
94
97
90
September
94.4
98
87
99
99
October
91.8
90
95
90
97
November
95.0
91
93
100
98
December
94.2
95
94
99
95
Average
94.3
97.5
94.1
93.1
94.6
95.4
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.