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
85.7
85
77
88
93
87
February
79.3
87
84
75
74
76
March
91.2
85
90
93
94
89
April
93.8
89
96
96
93
May
92.4
92
92
94
95
June
93.7
95
96
90
97
July
92.6
86
94
91
94
August
93.6
96
91
91
98
September
95.6
98
95
96
93
October
92.1
96
94
90
88
November
90.5
91
84
95
95
December
82.8
85
72
87
94
Average
90.2
85.8
89.8
89.8
91.1
91.8
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
13.1
11
16
12
12
15
February
17.3
20
19
16
12
16
March
20.6
21
20
21
22
23
April
23.1
21
24
23
22
May
27.0
24
29
27
27
June
30.0
26
33
30
31
July
31.3
26
34
32
32
August
31.7
31
32
32
32
September
30.2
30
30
29
29
October
24.8
26
24
25
25
November
18.0
20
19
18
20
December
15.4
16
16
20
14
Average
22.9
17.1
23.0
24.5
23.5
23.6
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
2.6
0
5
0
2
5
February
5.2
5
7
2
2
4
March
7.5
9
3
6
8
12
April
9.0
4
10
9
8
May
13.7
5
17
15
15
June
17.1
6
21
18
19
July
18.4
3
23
21
20
August
19.3
6
22
22
21
September
18.2
19
17
18
17
October
12.3
12
9
14
12
November
5.0
6
6
3
6
December
4.2
3
8
8
1
Average
10.4
4.8
6.5
11.8
11.8
11.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.7
12
13
9
7
9
February
10.4
9
12
12
8
16
March
7.6
12
9
7
5
10
April
6.3
11
7
2
4
May
3.9
6
3
3
4
June
4.6
4
1
10
4
July
3.8
6
4
4
4
August
4.3
1
8
7
1
September
3.9
5
5
2
6
October
5.3
7
5
3
5
November
6.0
5
12
5
4
December
7.0
6
15
3
2
Average
6.4
11.0
7.1
6.8
4.7
5.5
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
7.0
8
7
7
7
6
February
7.3
8
7
8
6
8
March
7.5
7
8
8
7
7
April
7.1
8
8
5
7
May
5.6
6
7
5
6
June
4.9
5
5
4
6
July
4.1
4
5
3
4
August
4.0
5
4
4
4
September
4.3
5
5
3
6
October
5.6
7
7
4
5
November
5.3
5
6
4
5
December
5.8
6
6
5
6
Average
5.9
7.7
6.1
6.2
4.5
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
254°
243°
313°
270°
221°
February
215°
229°
250°
309°
280°
March
132°
269°
226°
170°
227°
April
254°
192°
227°
301°
May
300°
188°
136°
229°
June
268°
345°
168°
183°
July
270°
226°
186°
185°
August
297°
185°
134°
280°
September
029°
007°
121°
052°
October
332°
205°
182°
124°
November
321°
296°
252°
060°
December
229°
174°
191°
256°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.