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
76.1
71
59
96
55
83
February
87.8
91
92
87
91
94
March
89.1
86
82
93
90
87
April
83.5
84
79
82
79
89
May
90.4
91
95
88
95
June
92.8
86
98
94
96
July
89.2
97
57
91
94
August
88.5
88
90
88
91
September
85.4
75
89
95
90
October
87.7
88
96
76
93
November
85.4
91
77
92
90
December
70.6
60
76
61
76
Average
85.9
82.9
83.0
86.5
84.6
90.4
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
-6.0
-5
-5
-10
-3
-5
February
-5.7
2
-4
-8
-9
-3
March
2.7
4
0
1
6
4
April
8.5
10
7
5
9
9
May
17.2
19
18
18
17
June
23.4
24
24
25
24
July
25.8
25
25
27
28
August
23.8
24
24
25
24
September
19.7
21
20
21
18
October
10.9
12
13
14
7
November
2.4
4
3
5
6
December
-3.1
2
-4
-3
-3
Average
9.2
2.8
10.9
9.4
11.8
10.7
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
-14.5
-11
-11
-21
-9
-11
February
-15.5
-7
-14
-20
-19
-15
March
-7.2
-6
-9
-8
-4
-4
April
-2.5
0
-1
-2
-1
-2
May
4.9
5
5
4
5
June
10.7
11
10
12
12
July
13.8
13
13
13
15
August
13.6
13
14
14
14
September
10.0
12
9
10
8
October
3.0
4
3
7
0
November
-5.3
-4
-4
-2
-3
December
-10.1
-4
-11
-12
-10
Average
-1.6
-6.0
1.3
-1.3
1.4
0.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.3
14
23
13
14
13
February
14.9
7
9
22
12
11
March
8.9
12
18
9
7
8
April
15.7
14
20
25
14
8
May
6.8
5
12
2
2
June
5.1
5
4
6
2
July
3.8
4
5
3
4
August
5.4
3
3
4
6
September
6.3
11
5
4
5
October
10.6
10
7
8
10
November
15.5
8
27
7
11
December
19.8
17
21
24
16
Average
10.2
12.2
10.4
11.8
8.1
7.1
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
6
6
8
5
6
February
7.8
8
7
8
7
8
March
7.8
8
8
8
8
7
April
8.4
9
9
9
8
9
May
7.2
8
7
7
7
June
6.7
6
8
6
7
July
5.7
6
7
6
5
August
6.0
6
6
8
6
September
6.2
6
6
7
7
October
7.3
7
8
6
7
November
7.3
8
8
8
7
December
6.4
6
6
7
6
Average
7.1
8.0
6.9
7.4
6.8
6.9
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
274°
299°
263°
270°
256°
February
280°
279°
292°
266°
267°
March
307°
019°
300°
211°
262°
April
034°
012°
031°
335°
306°
May
088°
170°
190°
010°
June
088°
255°
247°
150°
July
290°
255°
221°
250°
August
150°
238°
234°
244°
September
107°
232°
240°
254°
October
318°
260°
073°
259°
November
251°
273°
268°
250°
December
253°
187°
259°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.