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
97.3
96
100
98
93
97
February
93.7
95
87
90
95
95
March
93.5
80
99
91
91
98
April
94.0
96
99
96
94
91
May
97.3
98
97
99
94
June
97.4
94
97
99
99
July
94.2
99
94
91
94
August
88.9
92
94
84
97
September
93.7
98
95
96
94
October
96.8
98
92
97
100
November
97.7
99
99
98
93
December
96.5
96
92
97
97
Average
94.7
91.7
96.5
94.7
94.2
95.5
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.