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
86.1
78
84
92
95
82
February
87.1
93
92
84
80
92
March
93.2
98
86
93
94
88
April
93.0
97
92
93
89
May
95.6
95
93
95
96
June
96.0
96
96
95
99
July
97.0
94
99
96
98
August
95.9
99
97
99
96
September
96.2
95
100
100
87
October
91.6
90
96
94
90
November
87.1
63
88
97
98
December
91.9
98
76
95
97
Average
92.5
90.1
91.1
92.9
94.4
92.6
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
11.0
8
14
11
11
12
February
14.4
20
16
13
7
13
March
19.6
21
19
19
21
21
April
22.9
23
23
22
22
May
27.4
28
28
25
26
June
32.0
33
33
31
32
July
34.3
35
38
33
34
August
33.2
36
35
34
32
September
31.2
32
32
33
28
October
24.1
25
25
25
23
November
17.5
18
17
18
20
December
13.6
14
12
19
12
Average
22.5
16.0
24.2
24.1
23.3
22.9
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
0.2
-2
3
-2
1
3
February
2.7
6
5
-1
-2
3
March
7.5
9
8
5
8
10
April
10.6
11
12
10
10
May
16.6
17
18
15
15
June
21.1
21
21
21
21
July
23.5
24
25
23
24
August
22.7
24
23
23
21
September
19.4
20
18
19
18
October
12.2
13
12
14
11
November
4.6
0
7
5
7
December
3.5
4
5
7
1
Average
11.1
4.1
12.3
12.1
12.1
11.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.4
14
8
7
7
8
February
9.8
11
12
7
11
7
March
5.9
5
7
7
5
13
April
5.4
4
5
7
4
May
4.3
4
5
7
7
June
3.3
2
5
5
4
July
2.2
3
2
3
2
August
4.4
3
5
2
8
September
3.1
5
0
0
9
October
7.5
6
7
7
8
November
4.9
6
7
3
3
December
5.6
4
8
3
13
Average
5.7
9.9
5.1
5.2
4.8
6.9
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
7.9
8
8
8
8
7
February
7.6
7
7
7
8
8
March
8.2
8
8
8
8
8
April
8.0
7
9
8
7
May
6.8
6
8
7
8
June
5.9
5
6
6
6
July
5.4
5
6
5
6
August
5.4
5
6
5
5
September
5.4
5
6
6
5
October
6.6
7
7
7
6
November
6.5
4
7
6
7
December
7.2
7
8
7
7
Average
6.8
7.5
6.3
6.9
6.6
6.6
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
339°
276°
322°
319°
041°
February
277°
266°
285°
012°
327°
March
217°
041°
256°
158°
102°
April
267°
119°
299°
332°
May
088°
137°
097°
064°
June
084°
104°
146°
157°
July
232°
157°
118°
147°
August
046°
092°
126°
064°
September
077°
056°
070°
071°
October
307°
262°
262°
060°
November
047°
058°
050°
086°
December
301°
360°
270°
272°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.