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
89.7
91
89
94
95
87
February
92.3
94
98
92
95
77
March
96.5
97
98
95
95
98
April
98.4
99
99
99
98
100
May
98.4
99
100
98
98
June
96.4
94
99
97
99
July
92.4
93
94
95
95
August
91.6
93
92
96
97
September
94.2
96
92
100
95
October
98.2
98
99
99
98
November
97.8
97
100
99
96
December
90.3
91
93
96
97
Average
94.7
95.2
95.3
94.8
96.7
94.6
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.