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
88.6
94
97
84
98
82
February
95.4
98
97
97
98
98
March
97.2
99
98
100
99
99
April
99.2
99
97
100
100
May
99.3
100
100
99
99
June
99.4
99
100
100
100
July
99.6
100
100
98
100
August
99.7
100
100
100
100
September
99.7
100
99
100
100
October
95.7
97
94
92
96
November
91.2
98
92
91
80
December
86.8
87
83
79
87
Average
96.7
96.9
98.0
96.7
96.7
96.0
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.