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
88.1
81
93
97
89
76
February
83.1
91
89
94
79
80
March
91.9
96
89
99
96
75
April
89.5
97
97
91
82
May
86.8
97
93
87
84
June
89.8
98
98
94
58
July
97.7
100
100
97
93
August
96.4
100
96
95
50
September
92.0
96
99
97
82
October
77.3
91
96
96
58
November
83.8
93
80
95
94
December
85.9
86
73
93
90
Average
88.3
89.8
94.3
94.5
92.5
79.0
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
10
16
14
12
13
February
14.5
19
16
14
8
14
March
20.3
21
20
21
21
21
April
22.7
22
25
22
22
May
27.0
28
29
24
26
June
31.2
32
33
31
31
July
34.0
35
38
32
33
August
33.3
38
35
33
23
September
30.7
33
32
32
26
October
23.9
24
25
26
22
November
18.2
19
16
19
21
December
14.6
15
14
21
14
Average
22.4
16.5
24.9
25.0
23.5
21.8
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
0.5
-2
2
-2
2
3
February
2.0
5
3
-2
-2
3
March
7.8
9
8
5
8
10
April
10.5
10
12
11
10
May
16.0
16
17
16
15
June
20.4
21
21
21
21
July
22.6
23
24
22
23
August
22.5
24
23
23
22
September
18.7
20
18
18
16
October
12.2
12
11
13
10
November
6.1
6
5
6
8
December
3.4
4
5
7
2
Average
10.6
3.9
12.3
11.8
12.0
10.9
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
7
6
1
4
8
February
6.1
5
8
5
8
3
March
2.7
3
3
2
4
5
April
3.4
2
3
6
1
May
4.2
2
3
11
6
June
1.9
2
1
3
0
July
1.8
3
3
3
1
August
2.8
0
4
5
0
September
2.8
2
1
2
1
October
2.5
7
5
2
1
November
3.7
6
7
1
2
December
4.4
3
2
1
7
Average
3.5
4.9
3.4
3.0
4.1
3.2
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
6.5
7
8
8
8
3
February
7.0
8
8
8
9
4
March
7.5
9
9
9
10
2
April
7.9
9
11
9
6
May
6.8
6
9
7
7
June
6.4
7
7
7
6
July
5.8
7
7
6
5
August
6.2
7
7
7
5
September
5.8
7
6
7
6
October
6.5
8
6
8
7
November
6.6
7
8
8
8
December
5.4
7
7
8
7
Average
6.7
8.3
7.4
7.9
7.6
5.6
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
349°
239°
330°
320°
130°
February
218°
233°
293°
018°
349°
March
166°
151°
192°
166°
076°
April
116°
152°
134°
120°
May
131°
153°
123°
125°
June
121°
140°
154°
163°
July
149°
159°
157°
146°
August
123°
135°
153°
110°
September
130°
148°
147°
122°
October
111°
145°
159°
111°
November
155°
132°
157°
159°
December
207°
179°
179°
264°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.