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
85.4
73
91
91
84
81
February
90.1
93
100
91
86
92
March
91.3
94
93
93
89
83
April
95.1
99
96
96
94
May
92.7
92
87
91
90
June
98.6
98
99
96
100
July
98.9
97
99
99
98
August
97.9
100
100
98
98
September
95.6
98
96
99
92
October
93.4
94
98
97
90
November
90.0
85
86
97
93
December
90.5
85
77
97
94
Average
92.8
86.7
94.3
93.5
94.2
92.3
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
7.7
4
9
9
8
8
February
9.9
15
12
9
3
9
March
16.2
17
14
16
18
17
April
20.8
23
22
20
21
May
25.3
27
25
22
24
June
31.8
31
31
31
34
July
33.6
34
36
32
34
August
33.0
35
36
34
32
September
30.1
31
32
32
27
October
21.6
23
24
24
19
November
14.3
15
13
16
17
December
10.5
10
9
15
10
Average
20.1
12.1
21.9
22.2
21.2
20.9
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
-4.1
-6
-2
-7
-2
-2
February
-3.2
1
-3
-5
-8
-2
March
3.6
4
3
2
5
6
April
7.4
7
8
7
7
May
14.2
14
15
13
13
June
19.7
19
19
20
20
July
21.7
21
22
20
23
August
20.6
21
21
21
20
September
17.3
18
17
18
14
October
9.0
10
9
11
7
November
2.1
2
1
3
4
December
-2.6
1
-1
0
-3
Average
7.9
-1.8
9.2
8.8
8.9
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.0
10
9
7
7
9
February
8.4
3
3
13
19
9
March
5.1
2
4
9
9
3
April
5.1
6
2
5
5
May
5.7
5
10
7
10
June
2.6
2
4
4
2
July
2.0
2
2
3
4
August
1.6
1
0
1
1
September
3.8
4
4
2
4
October
6.2
7
2
4
9
November
6.2
11
5
3
5
December
4.1
6
2
0
7
Average
4.8
4.8
4.8
4.9
5.0
5.3
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
10.5
10
10
10
11
11
February
11.3
11
12
12
11
11
March
12.9
13
13
13
14
11
April
13.2
13
15
13
12
May
10.7
9
12
11
10
June
10.5
8
11
9
13
July
8.8
9
9
8
9
August
9.0
8
9
11
9
September
10.3
10
10
10
10
October
11.3
12
10
11
11
November
11.0
10
13
11
12
December
10.3
10
10
10
10
Average
10.8
11.1
10.2
11.2
10.8
10.5
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
324°
305°
334°
323°
342°
February
199°
240°
339°
019°
345°
March
216°
353°
323°
183°
184°
April
212°
186°
252°
233°
May
147°
147°
134°
064°
June
137°
162°
169°
180°
July
175°
148°
152°
153°
August
209°
155°
169°
154°
September
168°
158°
178°
177°
October
115°
216°
289°
178°
November
169°
286°
208°
198°
December
266°
216°
202°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.