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
77.7
83
78
78
85
87
February
81.8
90
85
86
61
76
March
88.2
91
92
92
92
80
April
93.1
96
94
95
87
May
90.0
90
87
90
93
June
92.6
90
95
93
88
July
89.1
89
82
91
89
August
87.2
84
88
82
85
September
89.0
84
88
88
89
October
87.6
90
87
89
81
November
90.7
94
87
95
91
December
85.9
90
77
93
84
Average
88.3
89.5
88.4
87.2
88.2
86.1
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
6.6
4
10
4
5
9
February
11.2
11
14
11
6
9
March
14.2
16
14
16
16
16
April
19.4
21
19
18
17
May
23.3
22
25
22
21
June
26.3
25
27
27
26
July
28.5
29
28
28
30
August
27.4
27
28
28
28
September
25.3
25
24
25
24
October
20.0
19
18
21
20
November
13.2
14
14
13
17
December
9.6
11
9
14
7
Average
17.7
9.5
19.4
18.8
18.1
18.9
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
-1.7
2
3
-4
-1
2
February
2.7
9
4
1
-2
2
March
4.3
7
3
5
6
7
April
8.6
9
9
8
7
May
13.9
12
15
12
11
June
17.1
15
17
18
17
July
19.3
19
20
19
21
August
18.6
19
19
19
19
September
16.1
15
14
16
16
October
10.4
10
8
12
11
November
3.9
4
5
2
7
December
2.1
3
3
5
0
Average
9.2
5.0
10.1
9.5
9.1
10.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.0
17
19
21
11
9
February
9.8
10
7
8
15
15
March
8.1
4
7
6
5
9
April
5.0
1
6
6
7
May
4.1
5
6
3
5
June
3.2
2
2
3
5
July
2.0
1
5
2
2
August
2.1
3
2
4
2
September
2.9
2
3
4
3
October
4.6
5
2
4
4
November
5.0
3
7
2
4
December
9.3
10
7
3
14
Average
5.6
6.3
4.6
5.8
4.8
5.9
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
3.5
5
5
4
3
3
February
3.8
6
5
3
3
3
March
3.9
5
5
4
3
2
April
4.0
4
5
5
4
May
3.3
4
4
3
4
June
2.4
3
3
3
2
July
1.6
2
3
3
1
August
1.5
1
3
3
2
September
1.9
0
4
3
2
October
2.3
1
4
3
1
November
2.7
2
5
4
3
December
2.9
2
3
4
3
Average
3.1
5.1
2.8
3.6
3.4
2.4
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
206°
243°
212°
221°
221°
February
259°
233°
196°
229°
226°
March
259°
239°
241°
212°
222°
April
254°
245°
247°
237°
May
290°
236°
243°
216°
June
295°
281°
222°
247°
July
262°
244°
165°
280°
August
275°
254°
066°
251°
September
007°
311°
156°
123°
October
263°
254°
134°
089°
November
260°
223°
198°
205°
December
203°
238°
189°
200°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.