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
83.1
95
60
80
90
87
February
88.9
85
94
93
89
86
March
95.6
100
92
95
98
97
April
94.4
99
82
95
98
May
91.8
94
71
93
99
June
94.8
96
82
98
100
July
96.4
100
82
99
98
August
95.9
99
80
95
100
September
98.2
99
97
99
98
October
92.7
93
93
97
94
November
86.8
87
86
96
91
December
77.1
83
70
92
74
Average
92.0
93.4
91.6
84.4
95.2
94.1
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.