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
98.8
98
100
100
97
98
February
98.5
99
99
100
98
97
March
98.7
100
100
99
96
98
April
99.5
100
100
100
100
May
99.9
100
100
100
100
June
99.2
100
100
99
100
July
99.9
100
100
100
100
August
99.4
100
100
98
100
September
99.6
100
100
100
100
October
98.9
100
99
100
99
November
99.3
100
100
100
99
December
99.0
99
99
99
100
Average
99.2
99.0
99.7
99.7
99.0
99.1
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
14.6
14
15
15
13
15
February
17.8
19
17
17
19
16
March
22.2
22
22
23
22
21
April
27.3
28
29
27
26
May
31.3
31
33
31
32
June
35.6
36
35
35
36
July
35.8
40
37
33
37
August
34.1
35
32
32
37
September
31.3
33
31
31
31
October
25.1
26
22
26
28
November
19.3
19
16
21
21
December
14.9
15
15
18
14
Average
25.0
18.4
26.5
25.7
26.4
26.2
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
0.3
1
1
-1
-1
1
February
2.2
4
2
-1
2
1
March
6.1
8
6
4
5
7
April
9.8
10
11
12
9
May
13.7
14
15
14
15
June
19.3
19
21
19
19
July
21.3
24
22
20
21
August
20.0
21
20
19
21
September
16.6
18
16
17
15
October
10.1
11
10
10
9
November
4.0
5
1
4
5
December
1.0
0
2
4
-1
Average
9.7
4.3
11.0
10.2
10.9
10.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.3
2
1
3
4
4
February
2.8
2
6
1
3
3
March
1.9
1
1
2
1
8
April
0.3
0
0
1
0
May
0.2
0
0
1
0
June
1.4
0
1
5
0
July
0.8
0
0
2
0
August
1.9
2
4
3
2
September
1.2
1
0
2
1
October
1.9
1
4
0
2
November
1.5
1
1
2
0
December
2.4
1
4
2
1
Average
1.5
1.2
1.1
1.5
1.9
1.6
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
7.5
10
9
5
7
7
February
8.9
9
10
7
8
8
March
10.2
11
12
9
11
9
April
9.9
9
11
10
9
May
9.4
8
11
9
9
June
8.0
10
7
8
9
July
5.7
7
6
5
6
August
5.3
6
6
5
5
September
5.9
6
6
6
6
October
6.9
6
6
8
6
November
6.4
6
8
5
7
December
6.2
6
6
8
6
Average
7.8
10.3
7.8
7.4
7.6
7.2
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
252°
251°
257°
245°
283°
February
257°
244°
239°
257°
247°
March
244°
247°
246°
246°
229°
April
242°
249°
228°
249°
May
225°
243°
231°
240°
June
244°
230°
211°
228°
July
138°
134°
143°
149°
August
127°
086°
163°
140°
September
217°
121°
193°
154°
October
210°
241°
244°
206°
November
253°
246°
276°
214°
December
289°
256°
246°
273°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.