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
89.1
97
91
93
88
97
February
92.7
94
88
97
97
94
March
95.5
98
98
99
97
97
April
96.7
98
97
99
96
May
99.5
100
99
100
100
June
99.5
100
100
99
100
July
98.9
99
100
100
98
August
98.7
100
97
100
99
September
97.1
99
97
91
98
October
88.5
89
91
89
75
November
87.8
95
98
87
80
December
84.3
87
84
85
82
Average
94.4
96.3
95.3
96.2
94.5
93.1
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.