Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
89.0
83
93
83
98
91
February
93.3
86
95
95
98
94
March
95.4
97
95
95
99
99
April
97.0
97
99
91
100
100
May
97.2
99
99
87
100
99
June
98.1
100
97
95
100
99
July
99.4
100
100
97
100
100
August
99.0
100
100
96
98
100
September
99.0
100
97
97
100
100
October
96.7
100
99
100
98
100
November
92.9
89
88
93
100
92
December
84.5
80
89
81
93
Average
95.8
96.2
96.0
93.3
97.8
97.4
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km 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
13.4
14
15
11
15
13
February
15.0
15
14
17
17
14
March
18.8
18
20
16
20
20
April
25.3
28
24
27
29
24
May
32.1
31
32
30
37
33
June
39.5
42
38
40
40
39
July
42.8
43
43
43
43
44
August
42.7
43
44
43
43
41
September
38.1
37
38
39
37
40
October
30.5
29
30
32
30
33
November
21.6
20
22
22
23
21
December
16.2
17
18
15
16
Average
28.3
29.1
28.2
28.5
29.1
28.0
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
3.0
6
3
2
3
3
February
3.8
5
2
5
4
4
March
7.2
6
10
4
7
8
April
10.3
12
11
9
12
10
May
16.3
16
17
15
20
15
June
22.8
24
23
25
22
21
July
26.1
26
27
25
28
26
August
25.6
26
28
24
26
24
September
21.2
21
22
22
19
23
October
15.8
13
17
18
16
14
November
9.2
7
12
10
9
9
December
5.6
7
7
4
4
Average
14.1
14.7
14.9
13.9
14.0
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
8.3
5
6
11
9
16
February
7.3
8
4
5
4
11
March
8.3
6
8
2
5
11
April
3.2
1
3
0
1
5
May
1.5
1
1
1
1
3
June
0.2
0
0
0
0
0
July
0.0
0
0
0
0
0
August
0.0
0
0
0
0
0
September
0.0
0
0
0
0
0
October
1.0
0
1
1
1
0
November
5.1
1
6
7
2
9
December
7.3
7
4
2
4
Average
3.1
1.9
2.4
2.0
1.8
4.5
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
5.9
6
5
6
6
6
February
5.8
5
6
6
5
7
March
7.1
7
8
7
7
7
April
6.3
6
7
6
7
6
May
6.9
7
8
7
7
7
June
6.9
7
7
7
7
7
July
6.9
7
7
6
7
7
August
6.6
7
7
7
7
6
September
6.0
6
6
6
6
6
October
6.0
5
5
6
6
5
November
5.5
5
6
6
5
6
December
5.6
5
5
7
5
Average
6.4
6.2
6.6
6.4
6.5
6.2
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
181°
182°
155°
138°
142°
February
093°
202°
145°
205°
143°
March
168°
172°
193°
187°
141°
April
041°
182°
219°
246°
260°
May
200°
217°
221°
250°
239°
June
291°
246°
254°
276°
257°
July
245°
236°
273°
259°
262°
August
249°
201°
250°
231°
231°
September
252°
244°
259°
254°
264°
October
252°
229°
179°
266°
260°
November
236°
163°
221°
295°
101°
December
168°
307°
175°
355°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.