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
83.8
90
79
90
84
84
February
83.5
77
88
92
82
84
March
85.7
91
92
89
77
96
April
92.5
91
95
97
99
May
93.4
93
99
91
90
June
93.4
92
97
92
92
July
92.6
88
96
96
87
August
97.1
98
96
99
92
September
95.5
94
98
99
98
October
95.7
98
98
99
97
November
91.7
94
93
90
96
December
84.8
79
93
84
85
Average
90.4
86.2
90.5
94.8
91.1
91.7
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.