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
89.0
81
99
96
95
65
February
83.4
75
90
88
67
83
March
92.8
99
96
84
93
98
April
97.2
94
100
100
100
May
97.4
99
98
99
100
June
95.7
99
95
94
91
July
99.3
100
98
99
99
August
99.1
100
98
98
100
September
98.7
99
99
99
100
October
96.9
100
99
93
100
November
98.0
95
98
100
99
December
86.0
79
100
89
100
Average
93.6
84.7
95.8
95.9
94.1
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.