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
89.4
84
82
95
91
96
February
90.0
94
77
93
91
95
March
90.3
94
92
90
90
87
April
85.0
84
87
89
86
May
88.5
89
91
90
80
June
93.7
86
98
99
96
July
95.5
89
99
95
99
August
97.9
95
99
98
98
September
98.6
96
100
100
100
October
96.4
91
95
96
99
November
95.9
94
92
99
96
December
91.5
87
89
95
97
Average
92.8
90.2
88.5
93.8
94.5
94.4
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.