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
96.6
97
90
100
95
99
February
94.0
97
88
91
99
100
March
96.0
95
94
99
99
95
April
99.5
100
99
98
100
100
May
99.7
100
99
100
100
June
99.7
100
99
100
100
July
98.8
100
100
94
100
August
96.3
100
100
89
95
September
97.3
99
96
99
88
October
99.1
100
100
97
100
November
99.2
100
98
99
100
December
92.6
97
79
92
100
Average
97.5
97.2
97.3
97.3
96.8
98.0
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
7.0
8
2
8
7
9
February
7.9
8
6
10
9
12
March
10.3
10
7
15
12
10
April
16.2
16
16
16
18
17
May
20.4
20
20
22
22
June
26.5
23
27
30
26
July
32.3
33
32
34
32
August
31.0
29
32
32
32
September
26.0
24
27
27
29
October
19.2
20
21
17
23
November
11.4
11
8
14
11
December
6.4
9
1
6
8
Average
16.9
10.6
16.7
18.6
18.9
19.0
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
-5.4
-3
-8
-5
-5
-3
February
-5.0
-2
-6
-6
-4
-6
March
-3.8
-1
-3
-1
-3
-3
April
0.9
0
0
0
1
1
May
4.4
5
3
5
5
June
9.0
8
8
12
8
July
12.8
13
13
15
11
August
11.9
12
13
12
13
September
7.4
7
9
7
8
October
1.0
2
2
2
2
November
-4.6
-4
-6
0
-4
December
-5.1
-4
-7
-5
-6
Average
1.7
-2.4
1.7
2.1
3.1
1.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.2
5
15
0
6
2
February
8.2
4
12
0
2
0
March
7.8
9
15
3
3
7
April
1.9
2
2
3
1
1
May
2.6
3
1
3
1
June
1.1
1
1
0
1
July
0.2
0
0
0
1
August
0.3
0
2
0
0
September
1.3
3
3
0
0
October
2.3
1
0
8
2
November
2.1
1
4
1
2
December
5.9
5
12
10
2
Average
3.4
4.7
4.4
1.9
2.5
1.4
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
5.8
7
5
5
6
8
February
7.2
7
6
5
8
7
March
7.9
9
9
7
8
8
April
8.9
7
9
11
9
8
May
7.8
6
9
8
9
June
7.4
6
8
7
8
July
6.4
7
7
6
6
August
5.9
6
6
7
6
September
6.4
5
6
6
6
October
6.2
7
5
7
5
November
5.6
5
6
6
7
December
5.0
4
6
7
5
Average
6.9
7.6
6.2
6.8
7.1
6.9
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
253°
159°
166°
251°
262°
February
221°
239°
090°
297°
316°
March
256°
241°
278°
295°
242°
April
284°
248°
256°
278°
272°
May
244°
267°
292°
249°
June
271°
247°
249°
257°
July
255°
250°
260°
264°
August
221°
235°
239°
266°
September
240°
224°
225°
159°
October
173°
069°
250°
078°
November
101°
251°
238°
236°
December
192°
230°
255°
083°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.