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
98.1
99
99
99
97
98
February
96.8
92
99
96
96
99
March
94.8
93
93
91
93
95
April
93.1
95
98
94
96
May
90.6
91
91
94
98
June
86.4
82
89
93
87
July
85.9
87
83
95
90
August
93.9
94
98
94
94
September
91.7
91
98
84
94
October
96.5
96
99
97
96
November
96.7
95
98
95
98
December
97.7
92
99
100
99
Average
94.1
94.8
93.1
95.0
94.3
95.6
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.