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
82.1
75
72
84
95
83
February
87.8
93
85
84
86
92
March
89.5
93
92
85
96
82
April
92.2
98
89
97
97
May
92.6
74
92
100
96
June
98.2
95
98
100
98
July
94.8
85
100
87
98
August
91.9
90
99
95
97
September
92.3
84
96
98
95
October
92.2
91
95
82
93
November
82.2
89
79
87
89
December
90.7
96
90
84
86
Average
90.7
87.3
87.5
91.5
92.8
92.8
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
-7.6
-11
-5
-6
-4
-11
February
-7.7
-1
-3
-2
-12
-2
March
0.3
3
-3
3
4
-3
April
8.6
12
7
11
7
May
18.7
23
14
17
18
June
21.8
24
21
25
20
July
23.4
24
25
26
22
August
23.0
25
26
23
22
September
17.6
20
23
18
18
October
10.1
11
15
10
7
November
-1.5
5
-3
3
0
December
-6.6
1
-11
-13
-2
Average
7.4
-4.8
11.2
10.1
9.0
8.0
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
-16.6
-20
-12
-16
-12
-21
February
-17.2
-13
-13
-13
-22
-12
March
-12.6
-9
-15
-7
-8
-14
April
-4.8
-1
-3
-3
-5
May
5.0
7
3
4
4
June
9.2
10
9
10
9
July
11.0
11
12
12
12
August
9.9
10
11
11
9
September
4.9
5
6
6
6
October
-2.9
-1
2
-2
-3
November
-10.4
-4
-12
-8
-10
December
-15.3
-10
-22
-21
-11
Average
-4.0
-15.9
-2.9
-2.2
-3.3
-4.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
26.0
30
15
35
21
27
February
25.9
18
38
27
23
21
March
16.7
15
22
13
9
32
April
12.9
5
21
8
10
May
9.7
7
16
9
14
June
9.7
10
11
5
12
July
8.2
8
8
6
12
August
7.7
10
2
13
5
September
7.6
1
5
5
5
October
9.9
9
3
9
20
November
21.6
5
31
14
17
December
17.8
6
38
32
11
Average
14.4
20.6
10.7
15.4
11.5
14.7
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
6.4
4
6
8
8
5
February
7.2
6
8
8
8
9
March
6.6
7
5
7
7
9
April
8.3
8
9
8
9
May
8.6
7
9
8
9
June
9.3
8
9
9
10
July
8.1
7
9
9
9
August
8.7
8
8
10
10
September
8.4
8
9
10
9
October
8.5
7
9
9
9
November
6.5
8
8
7
6
December
6.3
5
7
7
7
Average
7.6
5.6
7.0
8.4
8.3
8.7
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
320°
275°
282°
261°
280°
February
301°
288°
280°
268°
267°
March
324°
002°
289°
275°
292°
April
290°
340°
284°
264°
May
232°
283°
274°
304°
June
281°
283°
270°
265°
July
271°
259°
285°
261°
August
265°
260°
268°
253°
September
248°
262°
259°
272°
October
272°
257°
254°
275°
November
260°
309°
249°
278°
December
252°
305°
280°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.