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
90.9
78
90
94
89
97
February
91.0
90
95
89
79
92
March
91.6
91
95
96
90
88
April
95.1
94
99
95
97
May
92.5
88
97
87
94
June
93.6
90
82
96
100
July
98.8
99
99
96
100
August
97.5
100
95
98
100
September
95.4
96
98
99
94
October
90.1
94
91
97
83
November
92.3
91
96
98
90
December
92.5
82
99
100
93
Average
92.8
86.2
92.8
94.3
93.7
93.9
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
11.6
8
12
13
11
13
February
13.7
16
15
12
8
11
March
19.0
19
18
19
18
20
April
23.0
23
25
22
22
May
27.4
26
30
25
29
June
32.2
30
33
31
34
July
34.4
35
36
32
36
August
33.2
35
32
33
35
September
30.1
32
31
32
28
October
22.6
24
22
26
24
November
17.0
18
14
20
19
December
13.3
14
13
18
12
Average
22.1
14.3
23.5
23.8
22.9
23.4
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
-4.9
-5
-2
-5
-2
-2
February
-3.5
1
-2
-5
-7
-3
March
2.7
3
2
1
2
5
April
6.2
6
7
6
6
May
12.1
13
13
12
12
June
17.3
17
19
18
19
July
19.7
21
22
19
21
August
19.1
20
19
19
19
September
15.6
17
16
16
13
October
7.8
9
9
9
6
November
2.1
3
1
3
4
December
-2.6
0
-1
2
-3
Average
7.0
-1.7
8.7
8.2
8.1
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.4
7
7
6
2
1
February
5.0
10
2
10
11
2
March
2.9
6
4
2
2
1
April
1.9
3
0
1
1
May
1.4
6
0
1
1
June
1.2
3
3
2
0
July
0.4
0
0
1
0
August
0.8
0
2
1
0
September
1.2
1
0
1
2
October
3.8
1
8
2
1
November
1.9
2
5
0
3
December
2.8
9
1
0
5
Average
2.7
7.4
3.0
2.9
1.8
1.3
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
12.2
12
12
13
12
12
February
13.2
13
16
13
11
12
March
13.6
13
14
14
15
13
April
14.7
14
15
14
14
May
12.7
12
15
13
12
June
12.2
10
13
11
15
July
10.1
11
10
10
10
August
10.4
11
9
11
11
September
11.4
11
11
12
11
October
12.1
12
10
13
13
November
12.4
11
14
11
14
December
12.4
13
13
14
12
Average
12.3
12.6
12.1
12.3
12.3
12.3
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
256°
270°
296°
297°
273°
February
263°
250°
313°
332°
306°
March
254°
241°
291°
223°
209°
April
223°
237°
228°
248°
May
176°
224°
158°
165°
June
170°
184°
167°
185°
July
196°
180°
178°
167°
August
193°
182°
188°
175°
September
195°
195°
197°
240°
October
216°
225°
232°
242°
November
256°
237°
254°
229°
December
267°
233°
240°
316°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.