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
96.8
91
96
100
95
98
February
96.4
96
97
99
97
100
March
96.7
98
98
99
94
98
April
98.4
96
99
98
100
98
May
98.9
99
98
99
99
June
99.5
100
99
100
100
July
99.9
100
100
100
100
August
99.3
100
100
97
98
September
99.3
98
100
99
100
October
99.0
98
99
98
100
November
97.5
98
98
99
95
December
92.3
98
86
92
97
Average
97.8
95.1
98.4
98.3
97.6
98.4
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
7.3
8
4
7
7
8
February
8.5
10
7
10
9
11
March
12.4
9
8
15
13
14
April
18.6
18
18
18
20
19
May
23.2
24
23
24
25
June
28.9
26
23
34
29
July
31.6
37
5
37
35
August
34.4
33
35
34
36
September
28.6
27
31
30
31
October
20.1
21
22
19
23
November
12.3
13
8
14
12
December
5.6
9
2
6
5
Average
18.7
11.3
18.8
17.0
20.7
21.0
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
-4.5
-3
-4
-6
-4
-3
February
-5.5
-1
-4
-8
-2
-6
March
-1.0
1
-2
-2
-3
-1
April
1.5
2
0
0
0
1
May
5.3
6
4
4
7
June
9.1
8
6
12
9
July
12.2
14
2
17
12
August
12.6
13
14
11
14
September
6.8
8
9
6
7
October
-1.7
2
0
2
-1
November
-4.1
-3
-7
-2
-4
December
-6.1
-5
-7
-6
-9
Average
2.2
-1.5
2.7
0.6
3.1
2.5
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
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
4.9
6
6
4
4
6
February
6.2
5
8
4
7
6
March
6.1
7
8
4
6
6
April
6.8
6
7
9
7
6
May
6.3
6
8
6
7
June
6.0
6
7
6
6
July
5.2
6
5
5
6
August
5.0
5
5
5
5
September
4.8
4
5
5
5
October
4.3
3
4
5
4
November
4.1
3
6
4
5
December
3.9
4
4
5
3
Average
5.4
5.9
5.5
5.4
5.3
5.5
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
245°
270°
356°
356°
245°
February
242°
236°
301°
265°
317°
March
242°
239°
295°
292°
247°
April
266°
281°
273°
293°
294°
May
256°
288°
298°
292°
June
323°
276°
306°
280°
July
283°
294°
293°
287°
August
316°
229°
292°
308°
September
291°
325°
318°
300°
October
315°
336°
264°
312°
November
275°
296°
338°
258°
December
305°
218°
241°
003°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.