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
94.5
100
93
100
86
100
February
94.2
96
93
99
97
97
March
93.6
92
87
96
99
97
April
97.9
100
97
98
97
98
May
95.2
99
99
98
76
June
98.3
99
98
100
97
July
99.6
100
100
98
100
August
98.5
98
99
99
98
September
97.6
97
93
97
99
October
93.3
95
95
94
94
November
95.9
97
98
91
99
December
92.2
91
97
95
88
Average
96.3
96.5
96.0
97.6
96.5
95.0
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.