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
84.8
90
77
84
84
93
February
89.8
92
88
100
88
98
March
93.7
92
93
93
92
97
April
94.3
89
93
95
100
May
96.1
95
99
99
97
June
97.2
98
98
95
95
July
98.1
100
99
97
99
August
97.6
96
99
95
99
September
95.6
98
96
93
99
October
93.5
94
97
94
93
November
81.2
93
80
85
91
December
87.4
92
60
83
90
Average
93.3
91.4
93.6
94.0
92.8
96.4
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.