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
98.6
95
99
100
100
100
February
95.8
74
100
100
100
100
March
95.7
86
70
99
100
100
April
85.5
0
98
100
100
May
82.8
0
98
99
100
June
96.5
48
100
99
100
July
92.1
52
99
99
100
August
93.1
61
99
100
100
September
98.3
90
99
100
100
October
98.8
94
100
100
100
November
98.5
94
96
100
99
December
98.9
97
99
99
100
Average
93.4
85.8
70.9
98.8
99.5
99.8
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.