Climate Grenchen Airport 2020-2024

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

Calculated from historical METAR data of Grenchen Airport (LSZG) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	49.1	60	51	51	57	47
February	69.5	82	67	82	66	84
March	78.1	74	78	88	85	82
April	88.8		78	88	97	94
May	87.1		87	94	87	87
June	92.4		98	93	90	87
July	93.6		96	97	84	98
August	92.3		95	94	91	93
September	87.6		89	87	84	82
October	68.8		81	62	69	73
November	47.4		60	69	35	37
December	39.8		45	32	29	40
Average	77.5	72.6	80.3	82.6	76.8	79.0

15th best VFR conditions of Switzerland

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	74.2	80	88	76	82	58
February	84.6	92	87	91	83	93
March	91.4	89	94	95	93	93
April	96.8		95	96	100	99
May	95.6		95	96	96	97
June	97.4		100	97	96	96
July	98.2		100	99	95	100
August	97.2		99	98	97	97
September	93.7		93	96	91	93
October	83.3		91	80	78	87
November	73.9		87	81	68	58
December	62.6		65	64	47	61
Average	89.4	87.4	92.7	91.6	87.9	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	4.2	6	5	5	3	5
February	8.1	11	9	8	8	10
March	11.6	13	12	14	11	11
April	15.8		13	15	15	20
May	19.2		20	22	16	20
June	25.1		27	26	25	22
July	26.4		27	28	24	26
August	25.8		26	28	23	25
September	21.6		25	19	22	22
October	16.1		18	18	14	13
November	8.2		9	10	6	8
December	4.8		7	2	4	5
Average	14.8	9.5	16.4	16.6	14.3	15.6

6th highest temperature of Switzerland

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	-2.5	-1	0	-1	-2	-1
February	-1.5	2	-2	0	-1	2
March	1.0	3	2	-1	0	1
April	3.5		5	4	1	4
May	8.1		9	10	6	8
June	12.7		13	13	13	12
July	14.2		15	14	14	13
August	13.8		15	14	13	13
September	10.1		12	10	11	11
October	6.4		7	10	4	6
November	2.6		3	4	2	3
December	0.3		1	-2	0	1
Average	5.3	1.2	6.6	6.5	5.2	5.9

7th lowest temperature of Switzerland

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	18.0	22	23	7	26	6
February	13.9	9	2	14	16	25
March	13.4	10	17	6	9	9
April	10.1		15	20	7	7
May	10.9		7	6	21	9
June	6.6		2	7	9	13
July	6.7		5	2	17	4
August	8.1		14	2	9	12
September	6.3		4	12	7	7
October	11.8		14	10	5	19
November	15.9		35	12	8	8
December	23.3		25	22	27	18
Average	11.4	13.1	12.2	8.8	12.9	10.7

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	6.3	7	7	6	6	5
February	6.4	5	6	8	5	9
March	7.0	6	8	5	7	8
April	6.3		7	7	7	5
May	6.1		7	5	7	7
June	5.0		5	5	4	5
July	4.9		6	5	5	5
August	4.6		5	6	5	4
September	4.8		4	5	4	5
October	4.6		5	4	5	5
November	4.5		6	4	5	3
December	5.3		6	4	5	4
Average	5.5	5.8	5.9	5.4	5.4	5.6

6th highest wind speed of Switzerland

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°	222°	193°	221°	230°
February	240°	056°	236°	124°	240°
March	244°	245°	076°	245°	099°
April		192°	088°	062°	078°
May		068°	042°	234°	073°
June		061°	126°	052°	214°
July		253°	058°	270°	250°
August		250°	081°	257°	234°
September		116°	233°	095°	189°
October		238°	234°	112°	232°
November		239°	231°	119°	104°
December		241°	067°	227°	230°

Prevailing wind direction

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