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
94.5
97
95
100
96
95
February
93.1
93
97
92
96
95
March
93.8
97
95
94
94
94
April
91.7
94
91
94
93
May
93.0
94
93
98
93
June
93.4
96
91
95
94
July
94.6
97
95
97
95
August
97.0
98
97
96
99
September
95.0
99
94
94
97
October
96.9
100
97
95
98
November
96.9
96
97
98
98
December
97.0
97
99
97
99
Average
94.8
95.5
96.3
94.8
95.8
95.8
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.