Climate Sundsvall-Härnösand Airport 2020-2024

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

Calculated from historical METAR data of Sundsvall-Härnösand Airport (ESNN) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	62.8	62	60	76	57	66
February	69.3	59	82	74	68	84
March	72.0	43	81	93	74	73
April	88.9		80	92	92	95
May	87.6		98	92	79	87
June	89.3		97	85	89	91
July	89.1		89	89	95	87
August	80.4		66	81	82	93
September	74.1		79	81	72	77
October	65.3		72	80	60	47
November	48.6		36	33	63	55
December	49.4		44	62	58	28
Average	75.5	52.4	79.2	82.7	78.6	79.8

1st 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	77.8	75	74	89	75	78
February	85.2	79	91	85	83	93
March	85.2	66	93	96	87	85
April	94.7		90	97	96	98
May	93.8		99	97	86	95
June	94.3		98	92	97	94
July	95.9		98	96	97	95
August	91.1		90	88	94	95
September	87.9		89	92	84	85
October	85.5		95	89	76	71
November	71.4		70	62	80	68
December	74.6		81	87	84	60
Average	87.4	71.8	91.7	91.2	88.9	88.7

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	-2.0	-4	-2	-1	-4	3
February	-1.1	-2	1	-1	-2	2
March	2.9	2	1	6	5	4
April	7.9		7	8	8	9
May	13.4		15	14	12	12
June	19.5		21	20	20	22
July	20.8		20	20	24	19
August	19.5		20	20	19	21
September	14.4		16	14	13	15
October	8.1		6	10	9	9
November	2.1		-2	4	1	6
December	-2.6		-4	-6	-4	3
Average	7.6	-2.7	8.2	9.4	8.4	10.2

30th 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	-10.7	-14	-8	-8	-11	-3
February	-10.8	-10	-8	-11	-9	-6
March	-7.8	-3	-9	-5	-4	-5
April	-3.7		-2	-3	-2	-1
May	2.4		3	3	3	1
June	8.9		9	10	10	10
July	11.2		12	11	13	10
August	10.3		12	11	10	10
September	6.3		8	6	6	6
October	1.3		0	1	2	3
November	-3.1		-5	0	-5	-1
December	-7.0		-11	-11	-10	-1
Average	-1.2	-10.9	-1.9	0.7	0.3	1.9

20th 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	21.9	21	22	16	25	18
February	17.3	17	8	14	13	6
March	14.6	19	11	6	10	17
April	7.3		10	8	7	6
May	6.2		3	4	6	8
June	5.5		2	5	7	2
July	6.6		8	9	2	12
August	7.4		14	4	11	2
September	9.4		8	13	13	7
October	12.8		9	5	15	20
November	19.2		35	20	11	15
December	26.8		40	25	25	23
Average	11.4	18.9	10.7	8.4	9.7	9.5

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	5.4	6	6	7	7	6
February	6.0	6	7	6	7	6
March	7.1	5	8	8	9	8
April	7.6		7	8	9	10
May	7.8		9	9	7	8
June	7.5		8	8	7	7
July	7.3		7	9	8	8
August	6.9		7	7	8	7
September	6.6		7	7	7	7
October	6.5		7	6	7	7
November	5.8		7	5	6	7
December	5.5		6	6	6	6
Average	6.8	5.6	7.4	7.4	7.6	7.5

30th 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	335°	077°	317°	327°	275°
February	126°	305°	310°	317°	241°
March	119°	322°	295°	297°	294°
April		008°	308°	312°	311°
May		258°	300°	076°	299°
June		273°	275°	173°	130°
July		113°	302°	258°	293°
August		102°	176°	331°	224°
September		225°	030°	326°	284°
October		316°	261°	176°	004°
November		337°	343°	311°	186°
December		323°	323°	322°	128°

Prevailing wind direction

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