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
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
-1.5
0
2
-3
-1
1
February
1.3
5
3
0
-2
0
March
4.8
8
5
4
9
6
April
9.7
13
9
11
8
May
16.2
15
18
16
14
June
22.4
20
24
26
23
July
25.3
25
25
25
27
August
24.7
24
26
26
25
September
21.5
22
22
22
21
October
15.2
16
15
17
13
November
7.0
9
10
8
6
December
2.9
6
3
4
Average
11.8
4.3
13.3
13.1
14.3
13.7
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
-6.6
-4
-2
-9
-6
-3
February
-6.8
-2
-4
-7
-8
-5
March
-2.5
1
-1
-3
0
0
April
2.5
5
2
4
0
May
8.0
7
10
8
7
June
14.1
14
14
18
14
July
17.9
18
17
18
19
August
17.9
17
19
19
18
September
14.8
16
15
15
14
October
8.6
9
7
13
7
November
1.0
2
3
2
2
December
-2.0
0
0
-1
Average
5.2
-2.2
6.7
5.8
7.5
7.1
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
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
9.2
9
9
9
11
9
February
9.4
8
11
10
10
10
March
9.6
10
10
10
10
9
April
9.3
9
9
9
10
May
7.7
7
8
8
8
June
6.2
6
7
6
6
July
5.9
5
7
6
6
August
6.3
7
6
5
6
September
7.1
6
7
7
8
October
8.0
8
8
8
7
November
8.7
9
9
8
15
December
8.5
8
10
9
Average
8.0
9.0
7.7
8.0
7.8
7.7
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
246°
338°
285°
337°
280°
February
274°
255°
296°
275°
296°
March
278°
003°
270°
314°
016°
April
178°
223°
336°
312°
May
062°
112°
044°
057°
June
065°
238°
148°
115°
July
073°
320°
034°
044°
August
031°
044°
105°
037°
September
100°
352°
013°
007°
October
295°
249°
086°
270°
November
256°
233°
253°
281°
December
240°
187°
235°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.