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
84.5
74
82
78
90
94
February
83.5
76
76
76
85
90
March
92.8
93
96
94
83
92
April
94.4
93
92
91
96
May
95.9
95
93
94
96
June
93.6
90
90
96
94
July
94.3
88
94
99
95
August
86.9
93
94
90
95
September
89.1
85
92
92
94
October
84.1
85
78
93
83
November
72.9
59
77
74
81
December
80.4
74
79
84
74
Average
88.3
81.5
85.5
87.8
90.1
91.3
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
-10.7
-11
-5
-10
-8
-13
February
-7.6
-5
-5
-4
-10
-3
March
0.9
3
0
2
0
-1
April
7.0
7
5
8
7
May
15.1
18
13
11
16
June
18.4
19
20
20
16
July
20.6
23
20
20
19
August
18.9
22
21
18
16
September
14.0
14
15
12
15
October
5.9
7
9
5
4
November
-4.2
-1
-4
-4
-5
December
-9.2
-4
-11
-16
-6
Average
4.9
-4.0
7.9
7.0
4.8
5.4
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
-18.3
-18
-13
-17
-17
-22
February
-18.2
-17
-15
-14
-21
-12
March
-13.4
-11
-15
-10
-13
-14
April
-6.8
-3
-7
-6
-7
May
1.0
3
-1
0
1
June
5.2
5
5
7
5
July
8.0
9
9
8
8
August
6.5
8
8
8
6
September
2.3
3
2
3
2
October
-3.0
-3
-1
-4
-6
November
-11.0
-7
-13
-12
-14
December
-17.2
-13
-20
-26
-14
Average
-7.7
-16.8
-4.5
-5.6
-6.0
-6.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
25.1
45
32
31
17
9
February
27.1
25
48
39
27
15
March
14.6
4
17
24
31
15
April
12.4
22
18
14
9
May
11.5
11
11
19
10
June
15.1
18
16
10
27
July
13.2
17
17
9
17
August
14.9
10
16
14
29
September
16.1
27
11
28
5
October
11.9
11
21
4
14
November
27.2
22
32
32
32
December
19.6
29
16
26
22
Average
17.0
23.5
21.1
20.1
18.1
17.0
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
4.5
5
4
4
5
6
February
4.6
4
4
5
5
4
March
5.6
6
6
5
5
6
April
5.6
6
5
5
6
May
5.3
6
5
5
5
June
4.8
5
5
4
5
July
4.5
4
5
5
4
August
4.4
4
5
5
4
September
4.3
5
5
4
4
October
4.1
4
4
5
4
November
3.4
3
4
4
3
December
3.3
3
3
3
3
Average
4.7
5.2
4.5
4.7
4.5
4.6
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
055°
069°
032°
063°
055°
February
072°
087°
206°
065°
186°
March
178°
061°
197°
186°
006°
April
194°
060°
211°
206°
May
213°
163°
215°
131°
June
222°
150°
208°
215°
July
207°
204°
210°
211°
August
205°
208°
214°
212°
September
204°
205°
212°
204°
October
167°
219°
185°
210°
November
011°
258°
052°
064°
December
082°
180°
065°
112°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.