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
85.0
67
90
95
82
February
92.9
96
94
95
85
March
87.7
91
87
96
84
74
April
95.4
95
98
96
96
93
May
91.0
92
93
91
88
June
89.5
99
98
94
68
July
73.4
98
97
98
2
August
83.2
97
98
98
40
September
94.2
98
97
96
85
October
94.5
95
97
96
90
November
93.8
93
92
99
91
December
86.2
79
69
97
93
Average
73.4
88.3
93.6
94.7
93.0
70.6
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
5.3
1
8
7
6
February
8.7
15
11
8
1
March
15.0
17
13
15
16
15
April
20.0
22
22
19
19
19
May
22.9
26
23
21
22
June
28.2
31
29
30
23
July
23.9
33
32
30
1
August
27.9
33
33
32
15
September
27.4
31
24
29
26
October
14.5
21
0
20
19
November
13.9
14
10
15
16
December
10.4
10
7
14
10
Average
19.6
13.6
21.0
17.6
19.3
16.4
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
-6.8
-8
-3
-7
-3
February
-5.6
1
-3
-6
-9
March
2.7
4
1
1
4
5
April
6.8
9
7
7
6
6
May
12.5
13
14
12
12
June
16.4
18
19
18
12
July
15.0
20
21
20
0
August
16.5
20
19
20
7
September
14.5
16
12
16
14
October
5.7
9
0
9
6
November
1.7
2
-1
3
3
December
-1.2
1
-2
1
-3
Average
10.0
1.2
8.2
6.7
8.1
6.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.7
10
2
3
9
February
8.0
4
3
8
20
March
5.1
4
4
7
9
2
April
3.0
2
2
1
6
5
May
7.4
5
7
10
7
June
3.1
2
6
4
0
July
1.8
1
3
4
0
August
1.3
2
1
2
1
September
2.6
4
2
3
3
October
4.9
6
2
11
3
November
3.0
5
4
0
3
December
3.0
7
2
1
3
Average
3.4
4.4
3.5
3.8
6.2
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
8.9
9
9
9
9
February
10.5
11
11
11
9
March
11.4
12
12
11
12
9
April
12.0
13
12
15
11
10
May
9.1
8
11
8
9
June
7.2
7
9
7
7
July
5.4
8
7
6
0
August
6.4
7
7
9
3
September
8.5
8
9
9
9
October
9.6
10
9
10
9
November
10.1
9
11
10
10
December
8.6
10
9
10
6
Average
9.5
11.3
9.2
9.7
8.9
7.0
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
300°
287°
301°
306°
February
233°
222°
303°
009°
March
216°
307°
265°
168°
156°
April
215°
222°
204°
250°
262°
May
158°
153°
156°
082°
June
132°
183°
191°
200°
July
187°
151°
165°
025°
August
210°
148°
176°
053°
September
171°
165°
189°
183°
October
293°
237°
305°
242°
November
186°
244°
216°
211°
December
252°
220°
208°
295°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.