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
79.8
68
66
84
90
83
February
87.2
87
83
84
86
94
March
87.5
94
83
87
89
89
April
91.1
92
79
93
99
May
91.0
74
91
96
91
June
91.5
75
88
100
91
July
89.2
67
94
89
92
August
90.2
82
93
91
98
September
90.0
74
96
91
95
October
89.8
85
93
79
93
November
79.2
74
88
76
83
December
88.3
92
81
92
88
Average
88.0
83.5
78.4
88.6
89.9
91.9
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
-7.1
-12
-3
-7
-3
-12
February
-7.7
-1
-4
-3
-12
-2
March
0.2
3
-2
4
3
-3
April
7.8
10
5
10
8
May
17.8
23
13
17
16
June
21.1
23
20
24
20
July
22.8
24
24
24
22
August
22.5
25
25
22
21
September
16.8
19
21
16
17
October
8.9
10
14
7
7
November
-2.6
3
-2
2
-2
December
-6.4
1
-12
-14
-3
Average
6.8
-4.4
10.7
9.2
7.9
7.3
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
-14.3
-18
-10
-15
-10
-19
February
-15.1
-11
-13
-12
-20
-11
March
-10.4
-8
-11
-6
-8
-13
April
-3.7
0
-4
-2
-3
May
5.6
9
3
5
5
June
9.7
11
9
12
10
July
11.4
12
12
12
12
August
10.6
12
13
11
10
September
5.7
7
7
7
6
October
0.0
1
4
0
-3
November
-9.4
-4
-10
-8
-10
December
-13.5
-6
-21
-20
-10
Average
-3.2
-13.5
0.5
-1.1
-2.2
-3.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
29.0
32
20
31
22
35
February
28.5
15
32
28
31
15
March
24.0
22
33
14
15
26
April
16.9
20
34
11
4
May
12.1
7
23
9
17
June
11.6
4
12
8
17
July
9.7
9
8
11
12
August
8.9
8
7
10
12
September
8.5
6
5
9
8
October
9.5
12
7
8
16
November
24.9
19
26
12
30
December
20.4
9
46
24
17
Average
16.9
23.0
14.0
18.2
13.0
16.5
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
8.9
8
8
11
10
7
February
8.9
8
10
9
9
10
March
8.2
8
8
9
10
10
April
9.0
9
8
9
10
May
8.8
8
10
9
9
June
8.8
8
8
9
10
July
8.3
6
9
8
9
August
8.9
7
9
10
10
September
8.9
9
9
11
8
October
9.8
8
11
11
9
November
9.1
9
11
9
10
December
9.4
9
10
9
10
Average
8.8
8.0
8.2
9.2
9.4
9.2
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
339°
238°
265°
225°
311°
February
258°
269°
252°
264°
244°
March
214°
332°
228°
249°
291°
April
201°
341°
253°
257°
May
231°
277°
236°
281°
June
243°
247°
241°
245°
July
239°
232°
244°
245°
August
241°
234°
240°
230°
September
222°
232°
230°
239°
October
235°
230°
221°
255°
November
225°
265°
199°
244°
December
200°
320°
273°
228°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.