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
89.0
77
94
90
92
94
February
94.6
97
99
97
92
98
March
97.6
92
98
99
100
98
April
98.5
100
98
99
99
May
98.9
100
99
99
98
June
98.5
99
99
99
98
July
99.8
100
100
99
100
August
94.7
98
68
99
100
September
98.6
99
100
99
98
October
96.6
98
99
99
97
November
95.7
94
91
95
98
December
85.1
79
84
84
83
Average
95.2
88.7
96.8
93.8
96.6
97.0
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
4.5
4
5
2
6
7
February
7.4
10
7
7
6
9
March
12.9
12
9
15
15
14
April
17.6
17
16
19
19
May
23.4
25
21
23
24
June
28.4
27
28
33
27
July
34.9
36
36
37
33
August
33.4
33
36
32
33
September
27.1
27
30
27
28
October
18.3
20
21
19
20
November
9.8
10
6
11
10
December
3.9
5
1
5
4
Average
17.4
8.8
18.4
18.7
19.6
18.9
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
-3.0
-4
-3
-5
-2
0
February
-3.6
1
-4
-6
-3
-2
March
0.9
1
-1
2
-1
1
April
4.0
3
2
3
4
May
8.9
11
8
8
9
June
12.9
12
12
16
12
July
16.8
17
18
18
16
August
15.6
17
18
15
16
September
10.3
11
12
10
9
October
3.9
6
4
6
4
November
-1.2
0
-3
2
0
December
-3.2
-1
-5
-2
-4
Average
4.7
-1.3
5.7
5.1
5.9
5.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
5.3
5
6
4
6
6
February
6.8
7
7
6
6
7
March
7.0
6
9
8
7
6
April
7.5
8
8
6
7
May
6.3
5
7
8
6
June
5.9
5
5
6
6
July
5.1
5
5
5
5
August
5.0
5
4
5
5
September
4.9
5
5
5
5
October
5.3
5
4
7
5
November
4.9
5
5
4
6
December
4.8
5
4
6
4
Average
5.8
6.0
5.9
5.6
6.0
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
174°
174°
143°
138°
155°
February
172°
192°
239°
321°
299°
March
253°
178°
311°
300°
276°
April
294°
274°
312°
319°
May
311°
304°
312°
309°
June
315°
329°
329°
323°
July
341°
327°
326°
336°
August
322°
324°
325°
323°
September
330°
318°
318°
337°
October
281°
304°
169°
325°
November
254°
159°
156°
182°
December
141°
178°
149°
174°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.