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
92.8
97
93
89
86
96
February
92.5
94
94
95
92
95
March
92.7
97
91
95
96
90
April
93.3
94
93
84
96
97
May
95.0
91
96
98
98
June
98.2
97
98
100
99
July
99.1
98
100
100
100
August
98.8
99
100
98
99
September
98.1
93
99
100
98
October
97.5
99
99
97
96
November
95.3
92
100
90
100
December
94.3
93
90
95
94
Average
95.7
95.4
94.7
95.5
95.8
96.9
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.