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
75.3
84
94
98
32
February
76.8
95
91
93
100
March
76.8
94
91
98
81
April
80.9
93
97
96
95
May
83.3
97
95
99
June
95.7
93
98
100
July
99.5
100
100
99
August
98.5
100
99
100
September
96.0
98
99
87
October
94.3
92
97
100
92
November
94.1
93
92
93
94
December
92.3
96
84
96
93
Average
86.8
91.3
95.2
96.2
83.9
94.2
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
14.2
11
18
16
12
February
17.2
20
17
15
14
March
21.8
22
22
23
22
April
25.3
26
24
28
24
May
29.7
29
32
30
June
34.0
35
36
33
July
37.4
39
39
36
August
36.1
40
36
37
September
31.9
35
33
28
October
25.0
26
27
27
25
November
19.7
20
18
21
22
December
16.4
17
16
23
16
Average
24.1
19.8
26.9
26.8
20.1
26.6
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
0.3
-1
3
-3
3
February
3.6
6
3
-2
3
March
8.4
10
9
5
11
April
11.3
14
10
13
10
May
16.8
17
18
16
June
22.0
22
23
20
July
24.0
24
25
24
August
23.5
25
24
22
September
19.6
22
18
16
October
12.8
13
12
14
10
November
6.4
7
6
7
7
December
3.4
4
6
7
1
Average
11.1
7.0
13.2
12.3
6.6
13.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.7
6
5
0
0
February
3.9
3
8
6
1
March
2.2
5
2
2
7
April
2.1
5
2
3
2
May
1.7
2
2
4
June
2.3
2
3
2
July
1.6
3
1
2
August
2.3
1
5
1
September
2.8
2
1
9
October
3.3
5
4
0
2
November
3.5
4
6
4
3
December
3.1
3
5
0
3
Average
2.5
4.6
2.9
2.7
1.3
3.3
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
7.0
7
8
7
5
February
7.7
9
8
8
9
March
8.1
8
8
9
7
April
8.2
8
7
10
7
May
6.4
5
8
6
June
6.0
5
6
6
July
5.1
6
6
5
August
5.3
6
6
5
September
5.2
5
5
5
October
6.5
7
6
9
6
November
6.0
6
7
7
6
December
6.5
7
6
7
7
Average
6.7
7.9
6.5
6.9
6.7
6.0
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
304°
267°
307°
300°
February
275°
256°
318°
266°
March
186°
265°
264°
177°
April
165°
084°
173°
207°
May
131°
153°
126°
June
141°
152°
147°
July
191°
167°
141°
August
166°
127°
140°
September
162°
157°
025°
October
003°
158°
279°
122°
November
211°
212°
166°
176°
December
252°
270°
212°
298°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.