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
91.6
91
94
81
90
94
February
92.7
100
93
81
94
89
March
94.6
94
94
89
90
93
April
97.6
100
93
98
98
95
May
98.7
100
97
97
100
98
June
98.0
93
97
100
100
100
July
97.4
98
98
96
99
98
August
97.0
98
97
93
99
94
September
95.2
91
94
97
97
October
91.1
93
90
89
88
November
89.0
89
94
85
92
December
91.6
93
75
90
97
Average
95.6
96.8
94.5
92.8
95.5
95.0
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
-16.0
-21
-8
-17
-10
-25
February
-15.1
-13
-13
-13
-19
-14
March
-4.7
0
-5
-2
-6
-7
April
6.2
9
5
4
5
5
May
15.7
15
17
14
14
17
June
21.4
22
21
23
23
19
July
23.5
23
28
23
24
20
August
20.0
20
23
20
19
19
September
13.3
12
14
12
13
October
2.7
2
4
4
-1
November
-11.2
-6
-9
-10
-14
December
-15.8
-8
-19
-22
-13
Average
4.2
7.0
5.5
4.2
2.8
1.6
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
-26.8
-31
-17
-26
-19
-34
February
-27.2
-23
-25
-24
-31
-27
March
-17.4
-12
-17
-13
-20
-21
April
-6.3
-3
-4
-8
-9
-7
May
3.4
4
3
2
3
4
June
9.6
10
9
10
10
9
July
11.1
11
13
11
10
10
August
8.6
8
10
10
9
9
September
2.4
3
3
3
3
October
-5.1
-5
-4
-2
-8
November
-19.3
-13
-17
-19
-24
December
-23.0
-19
-27
-31
-22
Average
-7.3
-5.6
-6.6
-7.8
-8.2
-9.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
28.8
30
26
30
28
24
February
22.2
18
35
32
25
21
March
18.0
18
19
21
27
26
April
6.2
3
16
3
7
11
May
8.2
10
9
13
8
6
June
7.8
3
13
6
2
12
July
5.8
5
3
13
3
12
August
9.5
7
7
7
11
14
September
9.1
10
8
10
13
October
25.1
31
35
27
22
November
31.3
21
25
45
31
December
27.1
30
35
28
29
Average
13.6
9.6
15.9
15.6
14.8
16.4
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
3.1
3
3
5
3
3
February
2.7
3
3
4
3
3
March
4.3
5
4
5
4
5
April
5.4
5
6
6
5
5
May
4.7
4
4
4
5
6
June
4.0
5
4
4
4
4
July
3.4
4
3
3
3
4
August
3.5
4
3
4
3
3
September
3.8
4
4
5
4
October
4.1
5
5
4
4
November
3.4
5
4
5
3
December
3.2
4
3
2
4
Average
3.9
4.1
3.9
4.1
3.9
3.9
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
027°
034°
021°
038°
358°
February
022°
035°
036°
060°
051°
March
011°
038°
025°
017°
300°
April
003°
024°
038°
034°
310°
May
075°
173°
015°
041°
042°
June
038°
287°
022°
315°
331°
July
245°
239°
272°
276°
277°
August
246°
233°
254°
263°
062°
September
070°
093°
042°
048°
October
038°
010°
052°
021°
November
017°
011°
015°
021°
December
029°
007°
018°
012°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.