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
86.0
86
85
96
91
0
February
91.9
93
86
99
92
100
March
96.2
99
89
98
100
100
April
98.4
95
100
100
100
May
99.5
100
100
100
June
99.8
100
100
100
100
July
99.8
100
100
100
100
August
99.6
99
100
100
0
September
99.6
99
100
100
0
October
99.4
99
100
99
100
November
98.6
99
98
100
98
December
90.2
92
84
95
95
Average
96.4
93.4
95.0
98.0
97.9
97.1
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
2.3
5
2
2
3
1
February
4.7
9
1
5
5
1
March
10.0
6
5
12
12
2
April
15.4
14
15
17
1
May
22.2
24
22
23
June
28.8
26
29
33
21
July
34.8
35
36
36
16
August
31.6
31
33
28
22
September
24.4
17
29
25
16
October
16.5
20
19
16
13
November
7.8
3
6
11
10
December
3.4
7
1
5
2
Average
14.5
6.7
15.5
17.9
16.4
8.6
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
-6.1
-5
-4
-7
-6
1
February
-4.7
0
-9
-6
-1
1
March
0.2
0
-3
0
0
2
April
3.6
2
2
3
1
May
8.6
10
7
9
June
13.9
13
13
17
20
July
18.2
18
19
20
16
August
17.1
18
17
21
22
September
9.5
5
12
10
12
October
4.3
5
5
5
3
November
-1.3
-1
-3
1
-1
December
-5.2
-2
-6
-4
-8
Average
3.6
-2.4
4.3
4.6
4.5
0.7
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
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
1.9
3
0
2
3
0
February
3.7
4
0
3
5
4
March
5.2
7
4
6
5
2
April
4.6
4
2
6
0
May
4.2
5
0
5
June
3.9
4
0
5
7
July
3.3
4
0
4
0
August
2.4
4
0
3
0
September
2.3
4
0
4
0
October
2.3
3
0
4
4
November
1.7
2
0
2
3
December
2.0
2
0
4
2
Average
3.6
4.7
3.2
0.8
4.3
2.9
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
276°
360°
327°
303°
360°
February
225°
360°
328°
240°
319°
March
185°
287°
289°
277°
153°
April
290°
279°
140°
360°
May
201°
360°
271°
June
229°
360°
229°
244°
July
233°
360°
237°
360°
August
236°
360°
232°
360°
September
219°
360°
311°
360°
October
231°
360°
242°
340°
November
272°
360°
305°
228°
December
294°
360°
228°
347°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.