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
89.3
92
88
93
86
88
February
88.9
98
97
95
88
81
March
93.4
95
93
98
96
91
April
97.0
99
98
96
96
96
May
94.4
96
97
96
94
June
95.3
94
98
93
95
July
94.9
95
94
96
96
August
94.8
95
93
96
95
September
93.3
92
93
93
95
October
92.9
93
97
96
88
November
94.2
98
93
96
93
December
90.0
91
88
93
90
Average
93.8
95.9
94.1
94.9
94.0
92.2
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
5.2
5
8
3
4
8
February
8.9
13
14
9
3
7
March
13.8
16
14
15
16
14
April
18.8
21
21
17
19
16
May
23.1
24
26
23
16
June
27.4
27
29
28
27
July
29.6
31
30
29
32
August
28.5
29
29
30
29
September
26.0
27
25
26
25
October
19.9
21
19
22
18
November
12.2
14
14
12
15
December
8.1
10
7
12
6
Average
18.0
13.5
19.8
19.0
18.6
17.8
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
-4.5
-3
-2
-8
-3
-1
February
-2.3
-2
-1
-4
-5
-2
March
0.6
2
0
0
-2
2
April
4.3
8
5
2
1
2
May
8.0
10
2
8
4
June
12.7
13
6
17
12
July
15.3
18
8
18
12
August
13.4
16
5
14
8
September
11.1
13
4
12
4
October
6.3
7
2
9
3
November
-1.9
-1
0
-1
1
December
-2.5
0
-1
0
-2
Average
5.1
1.2
6.6
1.5
5.7
3.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
19.4
23
23
11
12
19
February
15.5
12
11
12
15
25
March
11.9
21
15
8
5
9
April
12.2
22
13
10
11
12
May
11.9
21
6
8
18
June
5.8
12
3
7
4
July
3.1
3
6
4
4
August
3.2
3
3
8
5
September
5.5
3
4
7
5
October
11.6
11
19
9
12
November
16.4
13
49
5
8
December
14.4
12
19
7
14
Average
11.1
19.8
11.3
11.2
8.0
10.8
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
5.2
6
5
5
5
5
February
5.9
6
7
6
6
6
March
6.6
7
7
7
6
6
April
6.1
6
6
7
6
7
May
4.9
4
5
4
5
June
4.3
4
4
4
4
July
3.4
3
3
4
4
August
3.3
4
3
3
4
September
3.6
3
4
4
4
October
4.3
4
5
4
4
November
5.0
5
6
5
5
December
4.6
4
4
4
5
Average
4.9
6.2
4.6
4.8
4.5
4.8
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
249°
236°
256°
260°
248°
February
260°
238°
245°
287°
249°
March
265°
262°
244°
257°
248°
April
255°
246°
244°
249°
266°
May
003°
225°
272°
256°
June
298°
261°
213°
238°
July
243°
228°
260°
268°
August
257°
254°
241°
266°
September
046°
290°
226°
181°
October
260°
257°
221°
240°
November
247°
233°
239°
243°
December
242°
255°
221°
240°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.