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
73.8
66
59
87
65
84
February
83.8
92
84
88
83
96
March
85.3
87
71
79
92
87
April
85.7
88
80
81
95
89
May
91.3
93
91
93
95
June
92.4
82
93
94
96
July
95.5
97
96
93
96
August
91.6
94
86
88
95
September
89.9
87
92
98
94
October
86.8
84
82
88
89
November
85.7
100
65
95
91
December
74.9
71
68
75
92
Average
86.7
83.0
82.7
84.7
88.9
92.1
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
-4.3
-3
-2
-6
-3
-2
February
-2.4
6
0
-3
-7
-2
March
4.6
8
3
3
9
5
April
11.3
13
13
10
15
10
May
20.1
22
22
20
18
June
25.7
27
26
28
25
July
27.3
27
28
28
28
August
25.6
27
26
28
26
September
21.5
23
21
24
19
October
13.0
13
15
18
9
November
4.4
7
7
7
9
December
-1.3
4
-1
0
-1
Average
11.6
6.0
14.2
12.8
13.8
12.0
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
-11.7
-8
-7
-16
-9
-9
February
-12.7
-6
-9
-14
-16
-12
March
-5.3
-3
-5
-5
-2
-2
April
1.1
3
2
1
4
0
May
8.5
8
11
9
8
June
14.0
14
15
17
14
July
16.2
15
17
17
17
August
15.2
15
16
17
15
September
11.1
13
9
12
9
October
4.2
4
3
9
1
November
-4.8
-2
-3
-2
-1
December
-8.7
-2
-6
-7
-7
Average
2.1
-4.8
4.5
2.7
3.9
2.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.7
11
17
13
5
14
February
11.1
3
21
14
12
5
March
11.3
17
19
18
8
10
April
14.1
16
19
23
10
8
May
8.7
5
11
11
8
June
5.7
5
9
6
5
July
3.4
4
6
2
2
August
4.8
5
6
5
4
September
6.3
13
3
1
7
October
10.4
16
6
3
8
November
13.0
3
33
6
7
December
12.1
3
24
16
3
Average
9.4
12.7
11.2
13.5
6.9
6.5
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
7.0
7
6
8
6
7
February
7.9
8
8
8
8
8
March
8.3
8
8
9
9
8
April
8.9
10
10
10
8
9
May
7.5
7
8
7
8
June
7.2
6
8
7
7
July
6.3
6
7
6
6
August
6.4
6
6
6
7
September
6.9
6
6
7
8
October
7.8
8
7
7
8
November
8.1
6
8
9
9
December
7.3
7
8
8
7
Average
7.6
8.4
7.0
7.9
7.1
7.6
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
273°
288°
255°
284°
267°
February
233°
277°
257°
259°
281°
March
274°
348°
292°
218°
231°
April
269°
256°
208°
272°
283°
May
108°
164°
186°
014°
June
014°
226°
218°
191°
July
269°
243°
268°
249°
August
272°
238°
212°
246°
September
101°
242°
190°
245°
October
297°
227°
312°
260°
November
211°
236°
246°
236°
December
238°
129°
240°
252°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.