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
83.7
73
71
79
95
94
February
84.8
91
84
82
83
83
March
85.9
80
87
78
91
85
April
85.4
80
92
93
92
May
90.3
93
85
94
96
June
90.1
80
91
94
95
July
89.6
78
99
80
93
August
91.4
84
94
88
97
September
87.9
84
80
90
93
October
84.1
84
79
85
83
November
89.9
92
94
97
90
December
82.6
69
86
83
86
Average
86.9
81.3
82.3
86.9
89.5
91.1
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
2.7
3
5
1
2
5
February
4.8
6
5
5
2
4
March
8.4
9
8
10
11
11
April
14.3
16
14
15
12
May
21.2
22
23
21
21
June
25.8
24
26
28
27
July
28.9
29
30
26
30
August
27.7
26
30
28
28
September
23.5
24
23
23
24
October
17.4
19
17
18
16
November
9.8
9
13
11
13
December
4.6
8
6
6
5
Average
14.6
6.0
16.4
16.7
16.0
16.3
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
-7.6
-5
-3
-10
-6
-5
February
-6.4
-5
-6
-6
-7
-5
March
-2.0
1
-1
-2
-2
0
April
3.5
5
4
4
2
May
9.1
7
10
9
9
June
14.1
14
13
16
14
July
17.8
19
18
17
19
August
16.9
16
18
19
17
September
12.9
14
12
14
11
October
7.1
9
5
9
6
November
-1.4
-1
1
0
0
December
-5.8
-2
-3
-2
-4
Average
4.2
-4.8
5.9
5.3
5.8
5.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.9
28
25
17
10
5
February
15.4
6
21
20
21
13
March
13.2
17
18
15
5
12
April
16.1
14
11
13
23
May
8.5
6
6
8
4
June
7.4
12
5
4
2
July
7.6
13
5
16
2
August
5.7
11
3
8
3
September
8.0
14
10
7
4
October
12.2
12
9
14
16
November
12.5
10
12
7
12
December
14.2
17
17
7
14
Average
11.5
16.7
13.9
9.8
9.9
8.7
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
6.3
5
5
7
7
6
February
6.3
6
6
7
6
6
March
7.7
8
8
7
8
7
April
7.4
7
8
8
8
May
6.3
7
6
7
8
June
5.1
5
6
5
5
July
4.3
4
5
4
5
August
4.5
5
5
4
5
September
4.7
4
5
5
5
October
4.8
4
4
5
5
November
5.9
6
6
6
5
December
5.6
5
8
5
5
Average
5.8
6.5
5.2
5.9
5.7
5.8
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
314°
309°
311°
312°
304°
February
307°
300°
297°
315°
296°
March
318°
319°
301°
301°
330°
April
352°
310°
315°
314°
May
317°
059°
314°
303°
June
027°
305°
278°
324°
July
233°
286°
321°
250°
August
316°
306°
001°
300°
September
327°
316°
305°
306°
October
315°
326°
333°
307°
November
302°
295°
294°
298°
December
312°
315°
302°
304°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.