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
95.5
95
97
99
91
97
February
89.9
85
92
93
83
100
March
81.1
87
86
70
91
80
April
82.6
75
65
86
95
May
85.2
80
87
93
84
June
92.4
90
99
89
89
July
97.6
100
97
97
100
August
96.2
94
92
98
94
September
94.2
94
91
90
97
October
97.3
96
98
100
94
November
93.8
93
90
97
98
December
94.5
96
100
95
88
Average
91.2
88.7
92.6
89.4
92.7
92.9
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.