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
92.2
95
95
95
92
92
February
91.3
92
99
94
83
97
March
94.3
97
88
100
98
99
April
93.3
97
95
96
99
May
97.5
98
96
99
98
June
97.4
97
100
95
96
July
98.9
100
100
100
98
August
98.6
99
100
97
99
September
98.5
100
99
99
97
October
94.3
97
95
96
94
November
92.2
95
88
94
93
December
92.5
98
91
92
93
Average
95.4
94.6
97.0
96.5
95.5
96.5
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.