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
87.5
79
72
86
95
95
February
90.8
93
91
78
90
86
March
93.4
100
97
88
90
96
April
96.7
94
98
92
100
May
98.1
100
95
98
98
June
98.3
95
99
100
99
July
96.8
88
98
98
99
August
95.1
95
97
94
91
September
95.9
95
99
93
95
October
90.5
93
84
95
96
November
86.9
86
93
73
91
December
88.7
83
97
89
83
Average
93.8
91.9
91.7
93.5
93.2
94.9
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
-15.8
-17
-8
-15
-13
-21
February
-11.2
-9
-9
-8
-17
-7
March
-2.0
0
-3
-1
-2
-3
April
5.7
6
4
6
6
May
15.3
19
13
12
15
June
19.6
21
21
21
18
July
22.1
24
22
22
20
August
20.2
23
22
20
17
September
14.1
14
17
13
14
October
5.3
6
9
5
4
November
-9.7
-6
-7
-9
-11
December
-15.3
-11
-15
-24
-11
Average
2.9
-9.5
6.5
5.8
2.9
3.4
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
-23.4
-24
-15
-24
-22
-30
February
-24.2
-23
-20
-20
-29
-20
March
-17.4
-15
-18
-14
-17
-17
April
-7.4
-4
-9
-9
-7
May
2.5
4
0
1
3
June
7.9
8
8
9
7
July
10.3
12
11
10
10
August
8.2
9
9
10
9
September
2.8
5
4
3
2
October
-4.8
-4
0
-3
-6
November
-17.3
-14
-16
-16
-20
December
-24.9
-20
-24
-33
-19
Average
-9.7
-21.4
-5.3
-6.3
-8.0
-8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
27.0
41
20
31
15
17
February
24.0
17
40
36
24
29
March
19.9
7
21
28
25
18
April
12.4
16
11
14
7
May
8.7
5
8
12
14
June
13.4
10
10
10
14
July
9.2
7
6
6
13
August
16.8
11
11
15
36
September
9.4
13
9
11
6
October
12.8
13
13
3
15
November
26.2
18
14
42
27
December
19.6
14
29
15
27
Average
16.1
19.8
14.4
15.0
14.8
17.5
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
2.8
3
2
3
2
3
February
3.2
3
3
4
3
3
March
4.6
4
4
5
5
7
April
5.9
7
5
6
6
May
5.6
5
5
5
6
June
5.4
5
5
5
6
July
4.8
4
6
5
5
August
5.3
5
5
6
6
September
5.1
6
5
5
5
October
5.1
5
6
5
5
November
3.4
4
4
3
3
December
2.6
3
3
2
3
Average
4.6
3.6
4.5
4.8
4.6
4.9
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
214°
261°
131°
285°
116°
February
286°
186°
226°
271°
236°
March
153°
185°
154°
165°
279°
April
118°
117°
247°
282°
May
252°
212°
144°
121°
June
269°
127°
232°
261°
July
277°
251°
258°
263°
August
274°
267°
249°
233°
September
219°
235°
175°
260°
October
275°
167°
187°
264°
November
285°
264°
201°
291°
December
278°
256°
286°
137°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.