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
91.1
88
89
82
100
96
February
92.3
96
90
89
89
90
March
92.0
96
86
94
96
94
April
93.3
96
90
86
97
May
95.1
96
90
100
95
June
0
0
0
0
July
84.0
75
100
65
100
August
94.5
88
97
97
100
September
98.7
97
100
100
100
October
98.6
99
100
98
97
November
97.5
94
99
100
98
December
0
0
0
0
Average
94.9
95.4
91.9
95.1
93.9
97.1
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.