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
88.2
91
88
74
98
91
February
89.9
88
93
100
89
88
March
92.6
98
91
91
98
92
April
93.9
97
88
100
98
May
95.0
97
79
100
99
June
97.7
100
92
99
100
July
99.5
100
99
100
100
August
99.4
100
98
100
100
September
99.5
99
98
100
100
October
98.3
99
100
100
99
November
92.9
90
91
100
92
December
89.2
92
98
93
94
Average
94.7
92.5
95.9
92.1
98.3
96.6
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.