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
84.8
88
82
80
84
95
February
82.4
85
90
91
80
98
March
91.6
87
98
97
100
94
April
96.6
97
100
97
99
May
97.6
99
100
98
97
June
99.3
100
100
100
98
July
99.6
99
100
100
100
August
99.6
99
100
100
100
September
98.8
98
100
98
98
October
89.9
88
94
93
91
November
85.7
96
91
80
79
December
78.3
81
72
82
65
Average
92.6
86.3
94.8
95.5
94.0
94.0
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.