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
84.5
84
81
90
83
87
February
84.9
94
92
82
66
85
March
90.2
91
89
94
86
90
April
92.8
89
95
99
98
93
May
91.7
96
88
95
89
June
92.2
89
98
92
93
July
91.0
98
90
95
96
August
92.6
92
94
95
83
September
93.0
94
93
92
86
October
92.2
97
94
98
85
November
91.5
95
86
100
87
December
87.6
86
83
91
91
Average
89.8
89.4
92.2
91.6
91.0
89.3
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
9.2
8
11
7
8
10
February
12.9
13
15
12
9
12
March
15.8
18
16
18
14
18
April
20.1
22
21
20
14
20
May
24.1
22
25
23
22
June
27.4
26
29
27
27
July
29.9
30
30
29
31
August
28.8
29
28
30
29
September
26.0
25
25
26
24
October
21.6
21
19
22
22
November
15.3
17
16
14
17
December
10.9
12
9
15
10
Average
20.0
15.1
20.4
20.1
19.3
20.1
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
0.5
-1
2
-3
0
3
February
2.5
2
4
0
1
3
March
4.7
5
4
5
4
8
April
8.5
9
8
8
5
8
May
13.3
11
13
13
12
June
17.2
14
18
18
18
July
20.2
20
20
20
21
August
19.3
19
19
20
20
September
15.8
16
14
16
16
October
10.8
9
8
12
12
November
3.7
2
5
2
7
December
1.9
1
2
3
1
Average
9.7
3.6
9.2
9.3
9.5
10.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.6
15
15
9
10
14
February
11.2
7
10
15
14
17
March
9.1
11
10
6
10
9
April
8.2
5
10
4
2
10
May
6.7
5
8
4
11
June
5.7
6
3
7
10
July
4.3
4
8
4
4
August
5.5
9
4
5
10
September
5.5
5
9
8
7
October
5.4
3
5
3
10
November
5.5
3
11
2
6
December
9.5
14
9
4
8
Average
7.4
9.2
7.5
7.1
5.8
9.6
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
4.1
5
4
4
4
4
February
3.8
4
4
4
5
4
March
5.0
5
5
6
4
4
April
4.6
5
4
5
5
5
May
4.3
5
4
4
5
June
3.4
4
3
3
4
July
2.4
3
2
3
3
August
2.4
3
2
2
3
September
3.2
3
3
3
4
October
3.1
3
3
3
3
November
3.5
4
4
4
3
December
3.1
3
3
3
3
Average
3.7
4.6
3.7
3.5
3.3
3.8
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
295°
283°
322°
300°
300°
February
266°
263°
252°
337°
269°
March
320°
290°
236°
004°
224°
April
234°
197°
250°
281°
286°
May
068°
109°
284°
051°
June
022°
298°
151°
185°
July
253°
195°
190°
149°
August
270°
149°
109°
100°
September
046°
038°
178°
075°
October
283°
332°
330°
011°
November
323°
022°
302°
268°
December
323°
039°
219°
280°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.