Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
80.8
71
76
86
83
85
February
85.7
93
98
88
87
76
March
90.8
91
90
97
94
87
April
93.6
96
92
96
92
May
92.3
96
88
92
94
June
93.6
82
96
96
97
July
94.5
89
94
96
98
August
95.4
96
94
96
97
September
94.4
94
96
95
97
October
91.9
93
99
92
87
November
90.0
90
90
93
93
December
84.8
81
83
89
83
Average
90.5
85.4
90.1
92.2
92.8
90.9
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
3.7
3
7
1
3
6
February
7.3
11
12
6
1
5
March
11.8
15
12
14
15
13
April
17.2
19
16
18
15
May
23.3
23
25
22
21
June
27.6
27
29
29
28
July
29.5
29
30
29
31
August
28.3
28
29
30
29
September
25.9
26
25
27
25
October
19.3
20
19
22
17
November
10.9
13
13
11
14
December
6.9
10
6
11
5
Average
16.6
9.6
18.9
18.1
18.1
17.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-4.7
-3
0
-7
-2
-1
February
-2.0
0
0
-3
-6
-3
March
1.4
4
1
2
3
4
April
6.1
7
6
7
4
May
12.4
11
14
11
11
June
17.0
15
17
19
17
July
19.4
19
20
20
20
August
18.2
18
19
20
18
September
15.2
15
15
16
13
October
9.2
10
7
13
8
November
1.6
2
4
1
4
December
-1.4
3
0
2
-1
Average
7.0
0.3
8.5
8.2
8.6
7.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.9
26
19
16
12
17
February
12.4
7
8
18
9
17
March
12.2
11
14
13
7
11
April
10.6
8
17
9
14
May
8.7
7
11
7
14
June
5.4
7
3
6
5
July
4.9
4
10
6
4
August
3.4
4
3
5
3
September
5.5
3
6
6
4
October
7.8
10
1
9
8
November
9.2
7
10
7
13
December
12.0
13
14
11
11
Average
9.5
14.2
8.3
9.7
7.5
9.5
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
8.6
9
8
9
8
8
February
9.2
9
10
10
9
9
March
9.8
10
11
10
10
9
April
9.2
9
9
9
10
May
8.0
7
8
7
9
June
7.3
7
7
8
7
July
6.4
6
7
7
6
August
6.4
7
7
6
6
September
6.4
6
7
8
7
October
7.6
7
9
7
7
November
8.3
8
9
8
9
December
8.0
7
7
8
8
Average
8.0
9.2
7.6
8.0
7.7
7.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
244°
239°
260°
262°
237°
February
259°
234°
237°
299°
266°
March
250°
263°
239°
247°
247°
April
244°
237°
251°
276°
May
357°
169°
291°
226°
June
316°
256°
217°
259°
July
249°
247°
265°
263°
August
272°
248°
243°
270°
September
005°
275°
248°
204°
October
264°
239°
209°
228°
November
232°
229°
230°
238°
December
220°
244°
210°
239°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.