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
86.8
80
84
85
95
91
February
84.5
92
90
79
75
84
March
94.0
92
97
97
94
91
April
95.6
99
95
94
99
98
May
96.5
98
97
96
96
June
97.7
96
100
98
100
July
97.7
96
98
97
99
August
96.3
97
97
92
97
September
94.9
96
97
91
94
October
93.1
96
99
96
85
November
93.6
96
94
96
97
December
87.5
92
74
88
90
Average
93.3
91.2
94.6
93.7
93.4
93.8
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
10.3
7
14
9
10
12
February
14.4
17
17
14
9
12
March
18.0
20
18
19
19
19
April
22.2
23
22
22
22
21
May
27.0
26
28
25
25
June
30.9
30
33
31
31
July
32.7
32
34
32
34
August
31.4
31
32
32
31
September
29.2
30
29
28
28
October
23.3
24
23
24
23
November
16.2
18
17
16
19
December
13.1
14
13
18
12
Average
21.7
16.7
22.9
22.9
22.1
22.1
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
5
-2
2
4
February
3.8
5
6
1
0
3
March
7.0
8
7
7
8
10
April
10.3
13
10
10
9
9
May
16.0
16
17
14
14
June
19.9
19
21
21
20
July
22.4
22
24
22
23
August
21.5
22
22
22
22
September
18.2
18
17
18
18
October
12.0
13
10
14
12
November
4.8
6
6
3
7
December
3.5
4
5
7
1
Average
11.1
6.1
12.2
11.7
11.6
11.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.1
20
7
17
7
15
February
13.1
9
5
18
11
18
March
7.6
8
6
5
7
12
April
7.0
6
7
7
5
6
May
4.7
6
2
4
6
June
3.2
4
1
3
2
July
2.8
4
4
4
2
August
4.0
6
2
6
4
September
4.9
3
3
8
3
October
5.7
4
2
4
9
November
5.6
3
7
4
6
December
9.7
10
15
6
4
Average
6.8
10.2
5.3
6.0
5.5
6.7
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
7.4
7
8
8
7
7
February
8.0
8
9
8
8
8
March
8.4
8
9
9
8
8
April
8.0
9
8
9
7
7
May
6.8
7
8
6
7
June
6.2
6
6
7
7
July
5.2
5
6
6
5
August
5.2
6
6
5
5
September
5.4
5
7
5
6
October
6.4
7
7
6
6
November
6.6
6
6
6
7
December
6.9
6
6
8
7
Average
6.8
8.1
6.7
7.1
6.5
6.4
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
240°
228°
311°
266°
211°
February
225°
222°
227°
318°
247°
March
200°
233°
214°
148°
223°
April
208°
225°
203°
237°
281°
May
033°
191°
162°
203°
June
288°
323°
194°
193°
July
243°
222°
196°
228°
August
326°
172°
173°
333°
September
033°
024°
232°
057°
October
251°
212°
207°
252°
November
243°
245°
215°
221°
December
222°
196°
204°
230°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.