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
90.6
86
89
80
100
87
February
89.1
90
89
92
86
82
March
90.5
95
91
91
85
88
April
92.6
90
93
93
90
May
95.1
93
94
98
96
June
0
0
0
0
July
92.9
91
99
84
97
August
97.1
98
97
97
98
September
96.8
94
98
95
98
October
97.9
99
98
93
100
November
95.4
98
99
96
96
December
87.5
100
60
100
100
Average
94.0
92.3
93.4
94.7
92.7
93.9
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.