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
82.0
74
88
95
48
85
February
84.5
91
86
93
78
85
March
90.5
90
92
96
94
81
April
91.1
90
95
92
84
May
92.9
93
97
86
97
June
96.6
96
100
94
98
July
98.8
100
100
93
100
August
98.3
100
96
99
100
September
95.2
94
99
100
89
October
91.7
93
98
95
91
November
86.5
86
78
90
87
December
79.3
88
84
96
44
Average
90.4
85.1
92.3
94.6
89.3
87.5
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
15.4
14
19
16
10
18
February
18.0
22
20
16
13
17
March
23.1
23
24
23
23
24
April
24.8
25
28
18
25
May
28.7
23
32
26
30
June
33.9
36
36
32
33
July
36.2
39
39
32
36
August
36.2
40
36
34
37
September
31.2
36
33
33
29
October
24.1
27
28
28
26
November
20.5
20
19
21
22
December
16.8
19
19
23
9
Average
25.0
19.6
27.3
27.4
24.6
25.4
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
4.2
2
7
3
4
7
February
6.0
9
7
2
2
5
March
11.3
12
12
8
11
14
April
13.2
12
18
9
13
May
18.0
13
20
18
18
June
22.5
23
24
22
22
July
24.0
25
25
23
25
August
24.0
25
24
24
24
September
19.8
23
21
20
19
October
12.3
16
14
16
13
November
9.0
10
9
8
11
December
6.0
5
10
12
2
Average
13.4
7.5
14.9
14.9
14.1
14.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.2
5
7
6
2
2
February
5.9
2
7
4
7
9
March
2.3
2
0
2
1
7
April
2.2
5
1
1
5
May
1.6
1
1
1
3
June
1.3
0
2
2
2
July
0.7
0
0
0
2
August
1.4
0
2
0
1
September
1.7
1
0
0
3
October
3.8
2
1
0
0
November
3.9
1
11
2
0
December
5.0
4
6
0
0
Average
2.7
2.6
2.1
2.8
1.2
2.6
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
7.9
8
9
8
5
9
February
9.3
9
10
9
10
9
March
9.8
9
10
11
10
9
April
10.1
9
13
10
9
May
9.2
7
11
8
10
June
8.2
8
9
7
9
July
6.8
8
8
7
8
August
6.7
9
8
8
8
September
5.7
7
6
7
8
October
7.4
9
8
8
8
November
7.6
8
7
8
7
December
7.1
7
8
9
3
Average
8.1
8.9
8.3
8.8
8.0
8.1
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
318°
261°
296°
324°
195°
February
216°
237°
317°
335°
312°
March
156°
161°
186°
159°
154°
April
118°
163°
133°
143°
May
141°
162°
115°
141°
June
167°
156°
151°
157°
July
172°
173°
156°
158°
August
155°
149°
158°
158°
September
152°
121°
109°
032°
October
133°
152°
174°
110°
November
158°
112°
145°
155°
December
197°
174°
180°
305°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.