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
86.7
72
100
91
February
93.0
92
93
96
92
March
92.2
93
81
100
95
April
98.7
99
100
97
May
99.6
100
100
100
June
99.8
100
100
100
July
100.0
100
100
August
99.5
100
99
September
71.4
46
99
October
47.7
0
97
November
62.8
0
100
100
December
66.5
0
98
91
Average
89.0
85.2
67.7
99.5
97.3
95.3
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
1.9
4
3
-2
February
2.2
6
-3
-1
3
March
7.8
10
1
11
10
April
15.2
14
16
16
May
21.6
21
21
23
June
27.7
24
28
32
July
32.3
33
29
August
29.3
29
30
September
25.0
24
26
October
15.5
17
14
November
8.5
8
11
7
December
1.7
3
3
-1
Average
11.0
6.3
16.8
14.5
14.8
2.7
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
-9.4
-6
-8
-11
February
-7.0
-4
-11
-11
-5
March
-4.9
-2
-7
-2
-2
April
0.7
0
1
1
May
6.8
8
6
7
June
12.5
10
12
17
July
16.3
16
16
August
14.8
15
15
September
10.2
10
11
October
3.6
4
4
November
-3.7
-2
-1
-4
December
-8.0
-7
-6
-11
Average
-1.1
-4.0
4.2
0.7
2.4
-8.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
February
0.0
0
0
0
0
March
0.0
0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
0.0
0
0
0
July
0.0
0
0
August
0.0
0
0
September
0.0
0
0
October
0.0
0
0
November
0.0
0
0
0
December
0.0
0
0
0
Average
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
6.8
8
7
6
February
8.3
7
9
7
12
March
7.1
8
7
7
7
April
9.7
9
12
8
May
9.1
7
11
9
June
8.3
7
9
8
July
7.4
8
6
August
7.1
7
7
September
6.6
7
7
October
7.4
8
7
November
6.5
5
7
8
December
6.4
7
7
5
Average
7.5
7.3
7.2
9.1
7.6
6.3
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
277°
250°
141°
February
268°
243°
125°
269°
March
256°
260°
249°
248°
April
269°
269°
257°
May
224°
274°
242°
June
250°
262°
239°
July
267°
162°
August
264°
257°
September
214°
184°
October
225°
260°
November
194°
268°
251°
December
270°
262°
148°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.