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
January
92.5
83
96
99
February
93.6
95
98
93
87
March
93.9
95
95
98
88
April
96.7
94
99
97
May
92.0
91
93
92
June
96.5
97
98
95
July
96.1
95
100
95
August
97.5
100
98
96
September
96.0
94
97
97
October
98.6
97
99
100
November
97.3
97
97
98
December
96.1
92
98
99
Average
94.7
91.1
95.2
97.3
95.0
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
January
10.0
7
11
12
February
11.5
16
14
11
2
March
18.2
19
18
18
18
April
23.0
24
24
21
May
26.7
26
29
25
June
31.7
30
33
32
July
34.4
35
37
32
August
34.4
36
34
34
September
31.7
31
32
32
October
23.8
23
23
25
November
16.3
17
14
19
December
13.8
12
12
17
Average
21.2
14.1
23.1
23.6
23.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
-6.2
-6
-4
-7
February
-6.6
-1
-4
-8
-11
March
0.2
1
0
-1
1
April
5.1
5
6
4
May
12.1
13
12
12
June
17.5
16
18
18
July
19.4
19
20
19
August
18.7
19
19
19
September
15.9
16
16
16
October
7.6
7
8
8
November
0.1
1
-2
2
December
-2.2
-2
-3
-1
Average
5.1
-2.0
7.1
6.9
8.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
4.3
3
8
2
February
6.7
4
1
8
17
March
4.4
6
2
2
7
April
1.1
2
0
1
May
2.8
5
1
2
June
2.0
3
2
2
July
2.2
2
3
2
August
2.6
1
3
4
September
2.6
7
1
0
October
2.6
1
5
3
November
3.2
3
5
1
December
2.7
7
1
0
Average
3.4
4.5
3.4
2.7
2.9
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
January
11.4
11
11
12
February
12.7
13
14
12
10
March
14.0
13
15
14
15
April
14.8
14
16
14
May
13.1
12
15
13
June
11.6
11
13
11
July
10.0
10
10
10
August
10.2
10
9
12
September
11.4
11
11
13
October
11.6
12
11
13
November
11.8
11
14
11
December
12.4
12
12
14
Average
12.2
12.4
11.7
12.4
12.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
239°
279°
321°
February
258°
254°
319°
014°
March
247°
239°
277°
227°
April
219°
226°
241°
May
166°
197°
153°
June
164°
173°
169°
July
191°
162°
165°
August
162°
177°
175°
September
174°
183°
193°
October
220°
204°
236°
November
253°
246°
262°
December
279°
241°
233°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.