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
85.8
83
78
93
84
89
February
84.7
89
86
84
71
89
March
90.1
80
91
91
90
94
April
93.1
89
94
100
98
May
91.0
91
85
98
83
June
94.5
90
99
94
91
July
95.2
92
93
97
97
August
92.8
90
94
93
89
September
91.2
92
91
95
86
October
87.6
91
90
95
82
November
87.7
94
87
98
88
December
86.5
85
80
94
86
Average
89.7
83.3
89.1
90.5
92.7
89.4
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
11.3
11
13
9
11
13
February
15.4
14
17
15
12
15
March
17.8
19
17
19
19
20
April
22.7
23
22
23
23
May
26.4
24
27
26
24
June
29.7
28
31
29
30
July
32.5
32
32
32
34
August
31.0
31
30
32
31
September
28.1
27
27
28
26
October
22.8
23
20
24
24
November
16.6
17
18
16
21
December
13.1
14
10
17
13
Average
21.4
14.7
22.0
22.2
22.2
22.7
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
0.8
0
3
-2
1
4
February
3.5
3
5
1
2
4
March
5.6
6
5
6
5
10
April
9.7
9
8
9
9
May
14.7
13
15
12
14
June
18.4
16
18
19
20
July
21.3
21
21
21
22
August
20.1
19
20
21
22
September
17.1
16
15
16
17
October
10.7
9
8
13
11
November
3.9
2
6
2
7
December
1.8
1
2
3
1
Average
9.7
2.7
9.9
10.2
10.3
11.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.4
14
15
9
10
12
February
11.2
9
11
15
16
11
March
8.6
16
11
8
5
5
April
8.7
14
5
1
8
May
6.0
8
5
3
12
June
4.7
9
1
5
6
July
2.7
2
3
5
3
August
3.5
3
1
4
5
September
6.6
8
10
4
8
October
6.0
6
5
3
7
November
7.1
6
9
3
8
December
10.7
13
13
5
9
Average
7.5
13.1
8.6
6.5
5.2
7.5
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
6.2
7
6
7
5
6
February
6.5
6
7
6
7
6
March
7.0
6
7
7
7
7
April
6.8
6
7
7
8
May
6.0
7
6
5
6
June
5.3
6
5
5
6
July
4.9
5
5
5
5
August
4.3
4
4
4
4
September
4.9
4
5
5
5
October
4.7
4
5
5
4
November
5.3
4
6
6
5
December
5.0
4
4
5
6
Average
5.7
6.2
5.3
5.7
5.4
5.7
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
260°
253°
301°
284°
275°
February
252°
244°
238°
316°
242°
March
294°
255°
236°
301°
225°
April
229°
252°
260°
265°
May
345°
297°
244°
275°
June
275°
271°
205°
237°
July
235°
218°
213°
218°
August
268°
233°
180°
207°
September
351°
343°
243°
011°
October
274°
326°
275°
324°
November
333°
327°
298°
245°
December
268°
280°
223°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.