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
88.5
88
69
88
92
99
February
86.9
86
88
89
87
89
March
88.3
90
90
83
91
82
April
92.6
93
91
98
92
92
May
89.6
88
92
85
95
June
96.7
91
97
97
99
July
95.5
92
98
96
95
August
95.7
96
98
95
97
September
91.8
95
92
99
97
October
90.2
96
75
99
96
November
93.6
98
94
99
96
December
93.4
89
92
99
91
Average
91.7
89.2
90.3
91.6
94.3
94.1
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
5.9
4
0
8
6
8
February
6.9
12
5
6
3
5
March
12.6
15
11
12
12
13
April
17.5
20
19
18
16
17
May
21.2
22
24
20
23
June
28.3
25
30
29
31
July
31.2
31
33
32
31
August
30.1
31
31
32
32
September
27.1
29
29
29
27
October
17.3
20
15
21
18
November
12.9
14
11
16
15
December
8.1
9
7
12
7
Average
17.6
12.4
18.0
19.0
18.9
18.8
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
-12.9
-12
-12
-11
-9
-11
February
-11.8
-6
-12
-12
-12
-11
March
-6.8
-5
-6
-6
-4
-4
April
-2.6
0
-3
-2
-2
-3
May
5.3
8
5
7
5
June
10.0
11
11
11
9
July
13.6
14
15
14
14
August
12.3
13
13
12
13
September
7.7
9
8
9
6
October
-1.1
0
0
0
-1
November
-7.7
-7
-8
-5
-6
December
-11.9
-9
-12
-9
-10
Average
-1.6
-6.2
0.8
0.5
1.0
0.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.8
9
15
11
8
0
February
8.4
9
14
12
7
10
March
5.6
8
4
14
6
4
April
4.9
7
5
1
2
7
May
4.7
6
6
6
1
June
1.8
6
1
1
2
July
1.0
1
0
1
5
August
0.9
1
1
1
0
September
1.5
3
1
0
5
October
4.2
5
1
1
1
November
3.7
7
6
0
1
December
5.5
11
8
0
6
Average
4.4
8.1
5.9
4.8
2.6
3.4
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
8.7
9
9
9
10
10
February
9.6
9
10
9
9
10
March
11.0
10
11
12
10
11
April
11.8
11
11
15
12
10
May
11.0
11
12
11
12
June
9.3
8
11
8
11
July
8.4
8
8
8
10
August
8.6
9
8
8
9
September
8.4
8
8
9
9
October
9.4
9
7
10
10
November
8.9
8
10
8
9
December
10.2
11
11
10
11
Average
9.7
9.9
9.3
9.9
9.4
10.0
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
337°
342°
343°
350°
316°
February
263°
351°
352°
175°
341°
March
342°
049°
344°
012°
209°
April
312°
321°
324°
354°
338°
May
120°
165°
148°
113°
June
151°
177°
116°
217°
July
062°
144°
133°
133°
August
174°
149°
136°
134°
September
186°
130°
021°
004°
October
339°
311°
359°
009°
November
349°
355°
343°
182°
December
330°
280°
201°
335°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.