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
84.7
86
86
82
89
89
February
86.1
95
94
86
67
78
March
92.3
90
93
99
95
88
April
95.1
96
96
96
97
96
May
94.1
95
94
96
92
June
95.1
94
99
98
0
July
94.6
97
90
94
100
August
94.2
93
96
93
September
93.8
95
96
94
100
October
93.9
98
99
93
80
November
90.9
92
90
97
95
December
86.4
85
76
90
84
Average
91.7
92.0
93.9
93.3
92.8
87.8
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
6.3
4
10
4
5
9
February
10.7
13
13
10
4
9
March
14.2
16
14
16
16
16
April
19.1
20
20
18
18
17
May
24.2
23
25
23
20
June
27.8
27
29
29
17
July
29.8
30
30
29
25
August
28.8
29
29
29
September
26.4
27
26
26
19
October
20.1
20
19
22
18
November
12.5
14
13
12
15
December
9.2
10
9
14
8
Average
17.7
13.2
19.7
18.7
19.1
13.3
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
-2.1
-3
2
-5
-2
1
February
0.6
1
2
-1
-2
0
March
2.8
4
2
3
3
6
April
7.0
9
6
7
6
6
May
12.9
10
14
10
13
June
15.9
13
16
17
17
July
18.6
18
19
19
25
August
17.7
17
18
19
September
14.4
12
13
14
19
October
8.6
8
5
12
9
November
1.6
2
2
1
3
December
0.3
1
1
3
-2
Average
6.9
2.6
7.7
7.3
8.4
4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.0
21
13
12
12
15
February
11.8
5
4
14
14
21
March
8.5
9
7
4
7
14
April
7.9
7
4
9
10
10
May
7.8
5
7
6
13
June
6.4
8
2
6
0
July
4.8
4
8
6
0
August
5.0
5
5
8
September
4.0
2
3
7
33
October
5.1
4
3
4
9
November
8.6
4
6
6
8
December
9.9
6
12
5
9
Average
8.4
9.9
5.1
6.0
7.4
12.5
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
5.8
6
5
5
4
6
February
6.2
7
6
7
4
6
March
6.9
7
6
8
6
7
April
6.0
7
5
6
6
6
May
4.7
4
4
5
5
June
4.4
3
5
5
0
July
3.9
3
4
4
6
August
3.4
3
3
4
September
3.5
2
4
3
3
October
4.3
3
5
4
5
November
4.7
2
4
5
5
December
4.9
3
3
6
5
Average
5.2
7.0
3.7
4.7
4.7
5.6
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
256°
249°
269°
258°
240°
February
248°
239°
238°
273°
252°
March
258°
255°
247°
253°
247°
April
245°
263°
249°
257°
277°
May
288°
224°
243°
290°
June
273°
266°
221°
360°
July
255°
249°
262°
216°
August
259°
253°
201°
September
294°
298°
254°
288°
October
264°
262°
231°
234°
November
236°
246°
237°
241°
December
238°
240°
229°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.