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
84.3
79
78
89
98
92
February
88.7
92
79
96
90
97
March
93.2
98
97
88
90
96
April
98.6
100
98
99
99
May
97.5
100
100
98
100
June
97.6
96
98
98
98
July
98.0
98
99
99
100
August
96.2
95
97
99
99
September
96.0
98
97
96
100
October
98.4
99
98
98
98
November
98.4
100
99
100
97
December
94.6
97
100
99
92
Average
94.2
89.7
94.6
96.3
96.9
97.2
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.