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
92.6
79
91
96
93
98
February
94.1
95
96
90
87
97
March
93.9
97
96
98
90
89
April
96.4
100
92
99
98
97
May
95.3
90
97
96
96
June
97.8
97
95
98
100
July
98.6
97
99
97
100
August
97.8
100
97
96
99
September
97.4
96
99
99
99
October
94.6
96
94
98
91
November
95.2
92
96
98
96
December
95.1
90
98
100
93
Average
95.5
92.8
94.4
96.4
95.9
96.2
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
12.7
9
13
13
13
15
February
14.9
18
16
13
9
14
March
20.3
21
19
20
21
22
April
24.6
26
25
27
24
25
May
28.9
28
31
28
31
June
34.0
31
34
34
37
July
36.1
36
38
34
38
August
34.8
37
34
35
37
September
31.6
33
33
33
30
October
24.1
26
24
27
26
November
18.3
20
15
21
20
December
14.2
15
14
19
13
Average
23.8
18.2
24.8
25.1
24.7
25.6
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
-2.5
-3
0
-4
0
1
February
-1.2
4
0
-4
-5
0
March
4.7
6
4
3
5
8
April
8.8
11
9
9
9
9
May
14.7
16
15
15
15
June
19.8
19
21
21
21
July
22.4
23
24
22
23
August
21.5
23
22
22
22
September
18.0
19
19
19
15
October
9.7
11
11
11
9
November
4.0
5
2
5
6
December
0.4
2
1
4
-1
Average
9.4
4.1
10.7
10.2
10.6
10.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.8
6
6
4
1
1
February
4.2
9
2
10
6
3
March
3.2
5
4
4
4
2
April
2.7
2
5
1
1
2
May
1.6
6
1
1
0
June
1.2
3
3
1
1
July
0.8
1
1
1
1
August
1.5
0
3
2
0
September
2.0
3
0
0
3
October
7.4
1
13
2
9
November
2.5
4
6
0
2
December
2.9
11
0
0
6
Average
3.0
5.5
3.7
3.7
1.5
2.2
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
9.2
9
9
9
9
9
February
10.3
11
11
10
8
10
March
10.7
11
11
12
12
10
April
11.9
12
11
13
12
11
May
9.7
9
11
10
9
June
9.5
8
10
8
12
July
7.9
9
8
7
8
August
8.1
8
7
9
9
September
9.0
8
8
10
8
October
9.3
10
7
10
9
November
9.4
8
10
9
10
December
9.2
9
9
11
9
Average
9.6
10.8
9.3
9.6
9.5
9.4
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
262°
261°
317°
303°
282°
February
254°
231°
324°
012°
325°
March
250°
212°
288°
224°
212°
April
223°
198°
207°
248°
264°
May
147°
180°
156°
119°
June
166°
146°
164°
193°
July
195°
146°
174°
174°
August
176°
155°
183°
171°
September
187°
172°
203°
240°
October
215°
194°
236°
239°
November
260°
229°
280°
227°
December
263°
213°
238°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.