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
90.0
95
83
86
82
100
February
85.2
85
92
87
68
85
March
89.5
84
92
89
89
84
April
91.1
86
93
100
86
86
May
88.6
87
90
81
98
June
97.4
92
100
100
100
July
97.0
95
99
98
100
August
97.8
97
98
94
100
September
94.9
99
93
100
93
October
92.4
93
96
100
94
November
91.7
95
93
71
96
December
94.0
91
100
100
91
Average
91.3
87.2
92.5
94.2
89.2
94.3
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
5.9
6
4
8
4
8
February
5.9
10
9
6
-1
6
March
10.8
12
10
13
6
12
April
14.7
18
17
18
10
15
May
19.3
22
22
15
22
June
26.4
24
28
23
29
July
29.2
31
32
26
31
August
28.4
31
31
25
32
September
25.0
28
28
22
26
October
16.0
19
19
14
18
November
11.1
14
9
11
14
December
7.5
10
9
7
8
Average
16.0
11.5
18.2
19.0
13.5
18.5
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
-3.0
-6
-5
-4
-2
-1
February
-4.2
-1
-4
-6
-6
-4
March
0.7
0
-3
-1
0
3
April
4.1
5
2
3
3
4
May
8.9
9
8
8
10
June
15.0
13
14
15
17
July
18.6
17
18
18
19
August
17.7
16
18
17
21
September
13.9
13
13
14
13
October
5.5
6
7
7
6
November
1.4
2
-2
4
2
December
-2.7
-1
-3
1
-2
Average
5.7
-1.5
5.5
5.6
6.5
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.8
5
7
13
18
0
February
8.8
8
8
11
3
9
March
6.1
9
2
10
11
8
April
6.8
10
7
0
11
9
May
6.8
8
8
11
2
June
3.2
7
2
4
2
July
1.8
2
2
0
2
August
2.7
4
3
0
2
September
2.1
1
1
0
5
October
4.9
5
2
0
4
November
5.0
5
7
0
2
December
3.5
4
0
0
5
Average
5.4
8.1
4.8
4.8
5.6
4.0
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
7.0
8
7
6
6
8
February
8.7
8
10
7
10
8
March
7.9
7
9
8
6
8
April
8.9
9
8
11
6
7
May
6.9
7
8
5
7
June
6.5
6
7
4
7
July
6.4
7
7
5
7
August
6.1
6
6
7
6
September
5.8
6
6
6
6
October
6.7
6
7
8
7
November
6.7
7
6
10
6
December
7.6
7
10
9
8
Average
7.0
8.0
7.2
7.3
6.3
7.0
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
308°
331°
308°
303°
286°
February
284°
297°
307°
281°
299°
March
336°
297°
344°
332°
306°
April
303°
315°
277°
345°
323°
May
004°
302°
338°
016°
June
360°
280°
321°
331°
July
010°
343°
350°
043°
August
020°
360°
315°
015°
September
031°
009°
059°
035°
October
345°
296°
324°
346°
November
287°
336°
290°
302°
December
285°
273°
297°
274°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.