Longfeng, Heilongjiang, China

Frost dates for Longfeng

The full distribution rather than a single date. Every figure below is a percentile of 30 years of daily minimum temperatures at this location, expressed as the date it fell on.

Median last spring frost

27 April

Half of years are later than this. Not a planting date.

Median first autumn frost

5 October

The far end of the outdoor season.

Frost-free season

161 days

Between those two dates in a median year.

Last and first frost by severity

Read a row as: in this fraction of years, the last frost of spring had already happened by this date. The 90% column is the cautious planting date; the 10% column is the gamble.

Light frost — nights at or below 0°C (32°F). Air temperature reaches freezing. Kills basil, beans and unhardened tomatoes; hardy crops shrug it off.
Frost	1 year in 10	Median	9 years in 10	Earliest	Latest
Last of spring	20 Apr	27 Apr	7 May	11 Apr	9 May
First of autumn	23 Sep	5 Oct	12 Oct	20 Sep	15 Oct
Frost-free days	175	161	139	every year on record saw this

Moderate frost — nights at or below -2.2°C (28°F). Damages half-hardy plants and most blossom. This is the threshold that decides a fruit crop.
Frost	1 year in 10	Median	9 years in 10	Earliest	Latest
Last of spring	13 Apr	22 Apr	30 Apr	3 Apr	8 May
First of autumn	3 Oct	12 Oct	17 Oct	30 Sep	30 Oct
Frost-free days	187	174	156	every year on record saw this

Hard frost — nights at or below -4.4°C (24.1°F). Ground freezes and even hardy crops check their growth. Effectively the end of the outdoor year.
Frost	1 year in 10	Median	9 years in 10	Earliest	Latest
Last of spring	3 Apr	11 Apr	19 Apr	22 Mar	24 Apr
First of autumn	11 Oct	17 Oct	30 Oct	6 Oct	4 Nov
Frost-free days	210	189	175	every year on record saw this

Dates in the southern hemisphere are computed on a growing year that starts in July, which is why "last of spring" falls where it should rather than in the middle of the calendar.

Chance of frost, week by week

Chance of at least one air frost during each week of the year, measured across the full record. The flat stretch in the middle is your frost-free season.

Temperature through the year

Mean monthly temperature across the record. Months shown in blue average at least one air frost.

Monthly means and average number of frost nights.
Month	Mean low	Mean high	Frost nights
January	-23.2°C	-13.6°C	31
February	-19.6°C	-7.8°C	28.3
March	-9.4°C	2.3°C	30.6
April	-0.3°C	13.4°C	17.2
May	7.6°C	21.8°C	0.4
June	14.5°C	27.6°C	0
July	18.4°C	29.8°C	0
August	16.1°C	27.4°C	0
September	8.6°C	21.7°C	0.4
October	-0.5°C	11.4°C	18
November	-10.4°C	-1.7°C	29.8
December	-20.6°C	-11.9°C	31

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Daqing Zone 4b 10 km Last frost 27 Apr First 5 Oct Anda Zone 4b 18 km Last frost 27 Apr First 5 Oct Honggang Zone 4b 22 km Last frost 27 Apr First 5 Oct Zhaodong Zone 4a 84 km Last frost 27 Apr First 5 Oct Qiqihar Zone 4b 125 km Last frost 28 Apr First 4 Oct Hulan Ergi Zone 4b 134 km Last frost 27 Apr First 5 Oct Suihua Zone 4a 143 km Last frost 30 Apr First 4 Oct Harbin Zone 4a 147 km Last frost 28 Apr First 6 Oct