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
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
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
-5.5
-3
-2
-9
-3
February
-3.4
1
-3
-4
-4
March
2.1
5
3
1
4
April
9.3
11
9
12
May
17.9
19
20
19
June
22.5
22
22
25
July
25.3
26
25
24
August
24.5
24
24
27
23
September
20.5
22
20
21
19
October
14.0
16
15
15
12
November
5.3
5
7
6
8
December
-1.1
1
2
0
1
Average
10.1
0.9
11.9
11.4
12.0
11.6
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
-12.9
-8
-7
-18
-8
February
-11.2
-7
-12
-13
-11
March
-5.0
-2
-4
-6
-5
April
2.2
3
2
4
May
9.1
9
11
9
June
14.7
15
15
16
July
18.3
19
18
17
August
17.4
17
18
19
16
September
13.2
15
13
14
12
October
7.7
10
7
9
6
November
-1.9
-1
2
1
1
December
-7.5
-3
-3
-7
-5
Average
3.2
-6.4
5.2
4.0
4.9
5.0
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
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
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
10.3
12
11
9
9
February
10.2
9
11
11
9
March
10.4
11
10
10
11
April
10.7
11
11
11
May
9.9
11
9
10
June
9.8
9
9
11
July
8.9
8
11
9
August
8.7
8
9
8
10
September
9.0
8
9
9
10
October
10.7
10
9
9
11
November
11.5
11
11
11
12
December
10.5
10
14
10
11
Average
10.1
10.6
9.6
10.0
9.7
10.6
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
273°
354°
334°
324°
February
264°
340°
324°
315°
March
324°
294°
287°
257°
April
174°
333°
003°
May
317°
121°
275°
June
054°
228°
216°
July
202°
226°
177°
August
242°
006°
219°
281°
September
189°
345°
251°
220°
October
231°
215°
035°
238°
November
244°
230°
250°
248°
December
001°
016°
314°
262°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.