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
83.4
94
80
82
74
91
February
83.7
82
80
90
79
82
March
93.8
92
88
96
93
95
April
98.1
99
96
98
98
99
May
98.8
100
97
99
100
June
99.5
100
99
100
98
July
95.8
98
100
100
98
August
96.3
98
99
82
98
September
96.4
97
97
95
99
October
95.6
95
98
99
95
November
87.3
87
93
90
85
December
78.5
85
93
85
69
Average
93.6
92.2
93.5
96.1
92.5
94.2
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.