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
90.4
97
87
89
89
95
February
90.6
90
86
84
91
99
March
90.6
90
88
85
92
91
April
90.0
93
82
91
93
May
93.5
95
92
93
93
June
95.2
95
91
98
95
July
98.6
99
99
97
99
August
98.5
99
100
95
100
September
97.1
95
100
98
98
October
94.5
85
95
96
95
November
92.5
83
94
94
95
December
90.9
89
94
89
96
Average
93.3
92.3
91.2
91.7
93.4
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.