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
88.2
86
82
90
85
91
February
87.0
93
84
92
80
81
March
93.5
94
95
92
96
91
April
96.3
97
96
100
98
May
94.8
95
94
97
94
June
94.4
93
97
96
94
July
93.3
89
91
97
95
August
91.2
85
93
96
91
September
92.4
90
90
95
91
October
94.0
94
95
89
94
November
94.4
99
94
98
98
December
89.1
91
73
92
94
Average
92.4
90.9
90.9
92.0
93.7
92.7
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
9.1
8
12
7
8
11
February
13.5
14
15
13
10
11
March
16.4
18
17
18
18
18
April
20.7
22
21
20
19
May
25.0
24
26
24
23
June
28.3
27
30
29
28
July
30.7
30
31
31
32
August
29.5
29
30
31
29
September
27.5
28
26
27
26
October
22.0
22
20
22
22
November
14.9
17
17
13
18
December
11.1
12
11
15
9
Average
19.8
13.3
21.1
21.1
20.8
20.3
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
-1.4
-2
2
-3
0
2
February
1.8
1
4
0
0
1
March
3.8
5
4
4
4
7
April
7.1
7
7
6
6
May
12.8
12
13
11
11
June
16.6
15
17
18
16
July
19.1
19
20
18
20
August
18.4
18
19
20
19
September
15.1
15
14
14
15
October
9.2
9
6
12
9
November
2.1
2
4
0
4
December
0.8
1
3
3
-2
Average
7.9
1.0
8.8
8.8
8.7
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.3
21
19
12
15
13
February
15.0
9
13
13
19
26
March
9.7
11
10
10
8
14
April
7.6
7
7
5
9
May
7.1
6
8
4
10
June
5.1
8
4
4
4
July
2.6
4
5
1
1
August
4.9
8
2
6
5
September
4.6
1
5
4
11
October
5.8
4
2
7
6
November
6.5
4
9
1
4
December
11.0
13
21
7
11
Average
8.2
13.3
7.8
7.2
6.4
8.9
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
5.3
6
5
5
5
6
February
5.1
5
5
6
5
5
March
6.1
6
5
8
5
6
April
5.8
5
6
6
7
May
4.7
5
4
4
5
June
4.2
5
4
4
5
July
3.8
4
4
4
3
August
3.4
4
3
3
3
September
3.3
3
3
4
4
October
3.8
4
4
4
3
November
4.0
4
5
4
5
December
4.3
4
3
3
4
Average
4.6
5.2
4.4
4.6
4.2
4.5
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
254°
257°
263°
261°
252°
February
265°
256°
242°
261°
257°
March
248°
262°
250°
266°
255°
April
242°
254°
260°
251°
May
247°
247°
257°
253°
June
256°
256°
252°
237°
July
245°
233°
245°
245°
August
256°
247°
244°
246°
September
253°
279°
243°
237°
October
265°
260°
245°
269°
November
276°
246°
249°
243°
December
254°
242°
245°
254°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.