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
91.4
81
92
100
84
91
February
90.6
95
90
93
80
90
March
94.2
93
95
98
98
83
April
94.9
93
95
99
92
95
May
96.5
98
99
91
98
June
97.3
92
99
98
98
July
98.8
100
100
96
98
August
98.3
99
97
97
99
September
93.4
95
99
99
83
October
93.7
93
98
96
90
November
92.9
95
95
93
96
December
93.5
97
83
98
92
Average
94.4
90.3
95.2
97.1
93.3
93.1
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
15.8
12
19
17
14
18
February
17.7
21
19
16
12
17
March
23.0
23
23
24
23
23
April
26.3
27
26
30
24
25
May
31.0
31
34
28
32
June
34.4
36
36
33
34
July
36.9
39
40
34
37
August
36.7
41
37
35
38
September
32.8
36
34
34
28
October
27.3
28
28
29
26
November
20.8
18
19
22
24
December
17.8
19
17
24
17
Average
26.0
20.9
28.2
27.6
25.7
26.5
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
1
5
0
3
5
February
4.8
7
8
1
0
4
March
9.7
10
10
7
10
12
April
12.8
15
12
15
12
12
May
18.3
18
21
17
17
June
22.6
23
26
21
22
July
24.3
26
27
22
25
August
24.2
26
25
23
23
September
20.6
23
21
20
16
October
13.7
15
13
15
12
November
7.4
6
7
8
9
December
5.1
6
8
9
3
Average
13.1
8.2
15.3
14.1
13.0
13.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.2
8
4
0
5
3
February
3.7
4
10
6
4
4
March
1.8
2
1
1
1
6
April
1.6
1
2
0
3
2
May
2.1
3
1
4
3
June
1.3
1
0
2
1
July
1.0
1
0
1
2
August
1.0
0
2
2
0
September
3.2
2
1
1
4
October
2.4
2
4
1
3
November
2.0
1
3
2
2
December
2.0
3
3
0
3
Average
2.2
3.5
2.1
1.6
2.3
2.6
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
6.1
0
8
7
7
4
February
6.6
0
8
7
7
7
March
7.9
0
8
10
10
7
April
8.0
0
8
11
8
7
May
8.2
6
10
7
7
June
7.3
6
7
6
7
July
6.0
7
7
6
6
August
6.6
7
6
6
5
September
5.1
6
6
7
4
October
6.0
7
6
7
7
November
5.9
2
7
7
8
December
4.7
0
6
7
7
Average
6.1
6.4
7.4
7.1
6.3
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
360°
240°
279°
291°
227°
February
360°
234°
234°
296°
255°
March
360°
221°
231°
193°
203°
April
360°
141°
197°
151°
194°
May
160°
175°
139°
157°
June
169°
162°
165°
169°
July
191°
180°
159°
164°
August
189°
161°
172°
173°
September
181°
161°
176°
006°
October
179°
186°
175°
167°
November
186°
200°
204°
194°
December
360°
202°
220°
260°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.