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
84.6
75
74
95
93
92
February
83.8
93
85
76
81
81
March
87.1
83
88
81
86
85
April
83.0
83
91
89
70
May
87.3
97
81
90
89
June
89.1
90
95
90
90
July
90.8
90
96
84
91
August
90.5
86
94
88
93
September
85.9
80
94
92
87
October
86.0
91
78
90
80
November
90.7
94
89
98
92
December
84.0
75
83
83
89
Average
86.6
83.5
86.3
88.0
88.7
86.3
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
4.4
4
8
2
4
7
February
5.9
6
7
6
3
6
March
8.6
10
9
10
10
11
April
13.7
16
14
14
12
May
19.4
21
20
20
19
June
25.0
24
25
26
26
July
28.3
30
30
27
29
August
27.5
27
30
28
27
September
22.8
24
23
21
23
October
17.9
19
18
17
18
November
10.3
11
14
11
13
December
6.0
8
8
8
5
Average
14.8
6.9
16.6
17.1
15.7
15.9
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
-1.1
0
3
-2
-1
0
February
-1.9
2
1
-1
-1
1
March
2.6
5
4
2
3
5
April
7.6
10
9
7
6
May
12.8
14
14
13
11
June
18.4
18
19
20
19
July
21.7
24
24
21
16
August
20.3
21
24
23
11
September
16.8
19
17
16
13
October
10.9
13
12
11
7
November
4.7
5
8
5
8
December
0.7
4
4
1
0
Average
8.7
2.1
11.0
11.3
9.7
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.5
13
16
12
8
4
February
11.2
6
8
14
18
12
March
10.9
16
15
11
3
9
April
11.1
9
3
8
14
May
7.0
5
4
9
4
June
4.0
5
1
1
4
July
2.9
2
0
6
1
August
3.8
6
1
3
4
September
9.0
14
7
7
4
October
11.3
6
13
10
14
November
7.6
4
9
5
2
December
12.1
11
21
6
11
Average
8.7
11.9
8.2
6.6
6.8
6.8
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
11.6
11
12
13
12
12
February
11.3
12
12
11
12
11
March
13.4
14
13
12
13
14
April
13.3
12
14
14
16
May
12.4
13
13
13
14
June
11.9
12
11
15
12
July
11.5
11
12
12
12
August
11.1
12
13
10
12
September
12.0
12
13
12
12
October
11.7
9
13
12
11
November
11.5
12
12
12
11
December
11.3
9
16
12
12
Average
12.0
12.5
11.7
12.5
12.3
12.5
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
325°
323°
304°
339°
305°
February
311°
309°
262°
339°
295°
March
338°
348°
270°
268°
022°
April
185°
289°
292°
315°
May
205°
156°
255°
258°
June
189°
206°
211°
200°
July
207°
229°
208°
200°
August
217°
216°
204°
209°
September
065°
354°
279°
190°
October
250°
035°
016°
266°
November
302°
273°
301°
260°
December
331°
349°
320°
309°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.