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
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
-5.1
-4
-3
-8
-3
-6
February
-5.0
-3
-7
-7
-3
-4
March
-1.0
1
0
-2
-1
-2
April
2.6
3
3
5
2
May
7.1
8
8
6
8
June
11.8
12
14
11
12
July
15.5
17
15
16
16
August
15.8
16
17
17
15
September
12.1
15
12
14
10
October
8.2
11
9
11
6
November
2.1
2
2
5
2
December
-2.5
0
1
-1
0
Average
4.3
-2.1
6.3
5.6
6.0
5.0
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
-12.4
-11
-11
-15
-8
-12
February
-12.1
-9
-15
-14
-9
-11
March
-7.8
-4
-4
-7
-6
-8
April
-2.5
-1
-1
1
-2
May
2.3
3
2
3
3
June
6.7
7
8
6
7
July
10.0
13
9
11
11
August
10.5
12
11
12
10
September
7.4
11
8
9
5
October
4.5
8
6
7
2
November
-2.0
-2
-3
2
-2
December
-7.3
-5
-4
-7
-5
Average
-1.1
-8.2
1.3
0.3
1.1
-1.9
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
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
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
15.1
16
13
15
12
14
February
15.0
14
13
15
14
17
March
14.7
13
13
16
17
15
April
13.5
12
13
13
16
May
12.6
13
12
17
14
June
10.8
10
11
11
11
July
9.9
9
11
9
10
August
9.9
10
9
10
12
September
11.6
10
11
12
12
October
12.7
12
14
11
12
November
15.3
15
15
16
13
December
16.2
15
19
17
16
Average
12.9
14.1
11.7
12.8
12.9
13.2
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
303°
351°
310°
356°
358°
February
318°
316°
305°
319°
295°
March
031°
332°
335°
307°
316°
April
269°
017°
054°
265°
May
290°
022°
269°
292°
June
086°
066°
298°
201°
July
122°
255°
238°
126°
August
088°
245°
249°
265°
September
355°
301°
302°
249°
October
031°
259°
050°
297°
November
310°
341°
287°
301°
December
302°
029°
310°
311°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.