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
90.3
88
92
77
97
90
February
91.8
92
96
85
89
89
March
92.0
97
92
79
89
91
April
96.5
98
99
93
95
93
May
98.5
98
96
98
99
June
97.8
95
97
99
99
July
95.6
85
97
100
98
August
96.5
96
93
98
94
September
95.2
84
99
92
97
October
89.7
90
84
96
87
November
86.7
88
80
84
86
December
87.7
98
76
86
85
Average
94.1
94.6
92.4
90.4
94.6
93.4
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
-17.8
-18
-10
-15
-13
-24
February
-15.5
-13
-13
-12
-20
-13
March
-5.9
-1
-5
-4
-6
-8
April
4.6
8
5
2
3
4
May
13.4
15
11
12
14
June
19.6
20
21
21
18
July
22.0
26
21
23
19
August
19.2
22
20
19
18
September
13.3
13
15
12
13
October
1.8
2
4
3
-2
November
-12.3
-7
-11
-11
-16
December
-15.3
-10
-17
-23
-12
Average
1.7
-7.8
5.0
3.7
1.7
0.9
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
-21.8
-22
-14
-19
-18
-28
February
-22.2
-20
-19
-17
-27
-21
March
-15.3
-11
-17
-12
-16
-17
April
-6.4
-4
-3
-9
-9
-6
May
3.5
4
2
3
4
June
8.3
9
8
9
7
July
10.0
11
10
10
9
August
7.9
9
8
8
8
September
2.1
4
3
2
2
October
-4.3
-4
-2
-2
-7
November
-17.9
-11
-16
-15
-21
December
-19.8
-15
-20
-26
-15
Average
-7.3
-15.6
-4.2
-5.3
-7.5
-7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
27.5
35
16
35
17
32
February
27.2
28
39
38
25
30
March
21.7
12
22
36
35
28
April
9.9
8
13
16
14
14
May
6.1
10
8
10
4
June
7.1
6
6
4
4
July
8.1
5
13
8
10
August
9.5
7
7
15
17
September
7.4
10
4
16
8
October
20.8
19
33
10
32
November
27.0
24
33
35
29
December
25.7
14
44
26
30
Average
14.8
18.2
13.3
18.3
15.8
17.2
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
4.1
4
3
4
5
4
February
4.6
5
4
5
4
5
March
4.9
5
5
6
4
5
April
5.8
4
6
5
6
6
May
5.5
5
5
5
5
June
4.8
5
4
4
5
July
4.3
3
4
5
5
August
4.4
4
4
4
4
September
5.0
5
5
5
5
October
5.3
6
6
6
5
November
4.2
5
5
5
4
December
4.7
5
4
5
5
Average
4.8
4.6
4.8
4.7
4.9
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
133°
114°
116°
128°
133°
February
149°
117°
130°
140°
285°
March
142°
136°
141°
308°
301°
April
188°
127°
129°
200°
271°
May
230°
178°
180°
115°
June
282°
122°
278°
284°
July
291°
287°
282°
295°
August
274°
268°
278°
216°
September
165°
152°
154°
214°
October
161°
161°
132°
224°
November
121°
113°
129°
125°
December
136°
274°
191°
133°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.