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
-7.9
-10
-6
-5
-4
-8
February
-7.5
-3
-5
-2
-11
-1
March
1.0
-1
-5
5
9
1
April
10.9
11
12
15
10
May
20.5
25
19
18
19
June
24.6
27
23
28
23
July
28.2
29
28
31
26
August
27.9
28
30
27
28
September
21.5
23
25
24
23
October
12.9
13
18
16
10
November
1.6
7
-5
8
2
December
-5.3
3
-12
-11
-2
Average
9.2
-5.3
12.5
12.1
12.5
10.6
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
-17.8
-19
-14
-16
-13
-18
February
-19.9
-14
-15
-15
-23
-13
March
-12.4
-11
-17
-9
-7
-12
April
-5.7
-3
-4
-5
-4
May
3.4
5
3
2
4
June
8.5
10
9
10
8
July
10.9
12
12
13
11
August
9.7
10
12
10
10
September
4.6
5
6
5
5
October
-4.9
-3
0
-3
-3
November
-11.6
-7
-15
-8
-10
December
-16.5
-9
-24
-22
-13
Average
-5.2
-15.2
-3.9
-3.3
-4.5
-4.8
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
6.9
6
5
8
8
7
February
7.7
7
7
9
8
9
March
8.4
8
6
10
9
10
April
10.1
9
12
9
12
May
9.5
8
9
9
11
June
9.2
9
10
9
9
July
8.1
8
7
8
9
August
8.3
9
8
8
9
September
8.9
8
9
10
10
October
9.7
9
8
10
10
November
7.9
8
9
10
8
December
6.6
6
8
7
6
Average
8.4
7.3
7.8
9.0
8.8
9.1
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
006°
304°
300°
276°
323°
February
326°
309°
308°
286°
280°
March
074°
081°
308°
265°
326°
April
139°
320°
319°
311°
May
112°
316°
126°
304°
June
261°
360°
288°
331°
July
325°
292°
047°
269°
August
354°
296°
284°
279°
September
240°
319°
250°
287°
October
288°
293°
221°
276°
November
242°
311°
252°
307°
December
171°
319°
307°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.