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
88.4
89
87
96
83
91
February
87.5
99
84
89
72
92
March
90.9
87
93
93
90
93
April
93.4
90
98
99
99
May
94.2
93
96
99
85
June
95.7
95
98
94
97
July
94.8
96
92
95
96
August
92.7
95
92
93
90
September
92.3
93
95
92
87
October
92.9
94
95
94
84
November
94.2
98
93
98
87
December
91.4
93
88
92
86
Average
92.0
91.7
93.1
93.9
92.5
90.7
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
12.6
13
15
11
11
14
February
16.2
16
18
17
12
15
March
18.8
20
19
20
20
20
April
23.2
23
24
24
23
May
27.0
25
28
27
25
June
30.4
29
32
30
29
July
32.5
33
32
32
33
August
31.7
33
32
32
31
September
28.7
28
28
29
27
October
24.3
24
23
25
24
November
18.0
19
19
17
20
December
14.9
16
12
18
13
Average
22.6
16.4
23.5
23.5
23.1
22.3
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
1.3
1
4
-1
1
5
February
4.3
2
6
3
2
6
March
6.3
7
6
6
7
10
April
9.9
10
9
8
9
May
14.7
13
16
13
14
June
18.9
17
19
19
19
July
21.3
21
22
21
22
August
21.0
21
21
21
23
September
16.6
16
16
15
17
October
11.1
10
8
13
12
November
4.3
3
7
2
7
December
2.6
2
3
5
1
Average
10.7
3.4
10.6
10.9
10.6
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.3
10
7
7
12
10
February
9.2
7
6
7
17
13
March
7.6
10
8
7
6
7
April
6.8
11
4
2
6
May
4.5
5
4
4
9
June
4.5
6
3
6
6
July
3.8
3
4
6
4
August
7.1
5
5
8
20
September
4.6
3
7
3
9
October
3.4
3
0
4
6
November
6.2
5
5
4
7
December
7.9
8
5
6
8
Average
6.6
9.2
5.6
4.7
6.0
8.0
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
3.9
5
4
5
3
3
February
4.2
5
4
5
4
4
March
4.6
4
5
5
5
5
April
4.4
4
4
5
5
May
4.1
5
4
3
4
June
3.6
3
4
4
4
July
3.2
3
3
3
3
August
2.9
3
3
3
4
September
2.9
3
5
4
4
October
2.7
3
4
3
3
November
2.6
2
4
4
3
December
2.3
3
2
3
3
Average
3.7
4.2
3.3
4.0
3.7
3.7
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
259°
242°
324°
311°
360°
February
260°
233°
221°
329°
238°
March
349°
283°
224°
009°
222°
April
202°
236°
277°
272°
May
003°
253°
309°
355°
June
353°
334°
177°
206°
July
210°
195°
184°
198°
August
243°
165°
143°
194°
September
008°
012°
343°
023°
October
316°
359°
307°
014°
November
354°
038°
332°
335°
December
286°
006°
216°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.