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
78.4
76
69
82
85
82
February
82.7
93
81
86
82
82
March
85.1
91
78
82
94
84
April
89.5
87
85
99
95
May
94.4
96
93
100
98
June
92.6
81
91
96
98
July
96.3
88
99
98
99
August
93.5
92
92
95
91
September
94.0
98
87
96
97
October
90.4
95
94
86
87
November
89.0
89
90
94
90
December
78.5
69
82
79
81
Average
89.0
86.8
85.7
89.0
92.7
91.0
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
-5.7
-3
-2
-9
-4
-3
February
-2.1
1
-3
-3
-4
-2
March
3.0
7
3
3
5
4
April
11.1
13
11
15
10
May
19.8
20
22
20
19
June
24.4
25
24
27
26
July
27.4
27
27
25
29
August
25.4
24
26
27
25
September
21.6
24
20
21
20
October
14.5
16
16
16
12
November
4.9
5
8
6
8
December
-2.9
1
1
0
0
Average
10.8
1.8
12.8
12.7
12.9
12.4
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
-13.4
-9
-9
-21
-10
-10
February
-13.8
-8
-12
-14
-15
-12
March
-7.9
-2
-5
-6
-7
-4
April
1.4
2
2
3
0
May
8.9
8
10
9
8
June
14.7
15
15
16
15
July
17.4
18
17
16
19
August
15.4
14
16
17
15
September
10.6
11
11
11
9
October
5.2
8
3
8
4
November
-3.2
-2
0
-2
-1
December
-9.8
-4
-5
-8
-6
Average
1.5
-7.5
3.7
2.6
3.3
3.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
31.9
34
46
24
20
29
February
27.2
19
33
30
28
28
March
21.7
17
31
24
12
22
April
19.8
23
20
12
19
May
12.6
15
12
8
4
June
11.0
9
20
8
6
July
6.4
8
10
7
6
August
7.7
10
15
4
11
September
7.9
3
13
9
8
October
17.0
23
13
20
16
November
20.7
23
17
15
14
December
30.2
37
31
23
29
Average
17.6
22.8
20.4
18.0
12.9
15.2
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
6.7
7
6
6
7
6
February
7.6
7
8
8
6
8
March
8.2
9
8
8
8
8
April
8.8
8
9
9
9
May
7.7
8
7
8
8
June
7.0
6
8
8
7
July
6.3
5
7
6
6
August
5.9
6
6
6
6
September
5.6
5
6
6
6
October
6.5
6
6
6
6
November
7.3
7
7
7
8
December
6.9
6
8
7
7
Average
7.1
7.6
6.6
7.1
7.0
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
279°
343°
337°
319°
340°
February
280°
060°
300°
296°
267°
March
321°
320°
302°
288°
048°
April
115°
344°
330°
289°
May
297°
136°
288°
279°
June
044°
266°
253°
253°
July
253°
258°
317°
276°
August
281°
243°
258°
301°
September
226°
337°
273°
245°
October
254°
220°
076°
269°
November
261°
259°
279°
279°
December
022°
078°
003°
298°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.