Climate Ärna Air Base 2020-2024

Climate and trends: average temperature, flight conditions, precipitation, wind speed and direction.

Calculated from historical METAR data of Ärna Air Base (ESCM) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	48.7	47	39	52	32	65
February	59.3	47	57	66	57	68
March	66.9	50	61	90	73	71
April	89.4		83	86	91	95
May	86.2		94	90	72	90
June	92.7		97	92	90	92
July	91.8		89	90	96	92
August	85.6		78	86	78	91
September	78.0		74	88	74	68
October	61.7		70	68	62	49
November	39.6		26	43	60	42
December	36.0		22	48	55	20
Average	73.1	48.2	73.8	81.1	75.1	77.3

7th best VFR conditions of Sweden

VFR conditions during daylight period

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	71.8	74	57	74	67	84
February	81.2	64	86	85	82	93
March	83.7	71	78	97	95	88
April	95.1		92	93	95	98
May	94.4		98	97	86	96
June	96.4		99	97	95	96
July	97.8		98	98	99	98
August	94.4		92	95	93	97
September	90.2		88	97	91	79
October	83.7		89	85	86	77
November	71.2		52	84	85	80
December	62.9		56	72	69	62
Average	86.6	69.2	86.9	92.4	89.6	90.2

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	0.7	-2	2	1	-1	6
February	2.0	1	2	2	-1	5
March	5.4	5	3	8	7	6
April	10.3		10	9	9	11
May	15.1		17	16	14	13
June	22.2		23	22	23	23
July	22.5		21	22	25	20
August	21.4		20	24	19	23
September	16.3		19	15	15	17
October	10.2		8	12	11	11
November	4.8		2	6	4	8
December	0.6		-2	-4	-1	4
Average	10.2	1.4	10.3	11.4	10.4	12.1

23rd highest temperature of Sweden

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	-5.4	-9	-3	-3	-5	1
February	-5.8	-3	-4	-3	-10	-2
March	-3.2	-1	-8	-3	-1	-2
April	-2.5		-2	-2	-2	0
May	3.5		3	4	4	2
June	9.7		9	11	11	9
July	10.9		11	11	12	9
August	11.0		12	12	10	10
September	7.2		10	5	6	8
October	3.8		2	5	5	5
November	0.5		-2	3	-2	3
December	-5.9		-7	-9	-8	1
Average	2.0	-5.5	1.7	2.9	1.8	3.6

26th lowest temperature of Sweden

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	21.7	32	21	12	35	7
February	17.6	26	16	16	20	13
March	16.5	18	27	2	14	9
April	6.6		8	9	8	4
May	10.6		8	7	17	11
June	5.7		3	9	6	5
July	7.3		10	9	5	8
August	10.0		17	9	14	5
September	7.3		4	10	7	7
October	11.8		15	9	13	13
November	16.1		35	13	12	10
December	23.3		48	13	13	17
Average	12.4	23.9	14.2	9.1	12.0	8.3

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	8.1	8	8	9	7	10
February	8.5	7	8	10	7	10
March	8.5	7	8	7	9	10
April	8.5		7	8	9	10
May	7.3		7	8	7	7
June	6.7		6	7	6	6
July	6.5		7	7	6	7
August	6.9		7	7	8	7
September	7.8		8	6	8	8
October	8.1		9	7	9	8
November	7.1		8	7	7	9
December	6.6		7	5	6	8
Average	7.5	7.6	7.2	7.3	7.4	8.0

23rd highest wind speed of Sweden

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	245°	210°	283°	340°	236°
February	202°	282°	243°	283°	232°
March	107°	301°	266°	275°	250°
April		048°	350°	319°	310°
May		225°	263°	077°	328°
June		052°	212°	235°	118°
July		218°	262°	158°	246°
August		158°	223°	307°	224°
September		221°	029°	249°	252°
October		318°	228°	219°	183°
November		002°	115°	240°	223°
December		341°	322°	281°	156°

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.