Safe to Plant

Bozhou, Anhui, China

Frost dates for Bozhou

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

22 March

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

Median first autumn frost

17 November

The far end of the outdoor season.

Frost-free season

240 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 8 Mar 22 Mar 3 Apr 28 Feb 15 Apr
First of autumn 2 Nov 17 Nov 24 Nov 1 Nov 29 Nov
Frost-free days 261 240 213 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 24 Feb 10 Mar 21 Mar 20 Feb 25 Mar
First of autumn 13 Nov 26 Nov 2 Dec 3 Nov 7 Dec
Frost-free days 281 261 237 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 9 Feb 23 Feb 11 Mar 25 Jan 22 Mar
First of autumn 16 Nov 4 Dec 14 Dec 3 Nov 29 Dec
Frost-free days 308 284 249 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

Jan Mar Apr Jul Sep Oct Dec
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

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F
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A
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J
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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 -3.8°C 6.6°C 29.3
February -1.6°C 10.4°C 19.8
March 3.3°C 17°C 6.4
April 9.5°C 23.7°C 0.2
May 15.5°C 29.3°C 0
June 21°C 33.2°C 0
July 24°C 33.2°C 0
August 23°C 32.3°C 0
September 17.6°C 28.5°C 0
October 10.8°C 22.9°C 0
November 3.4°C 15.4°C 6.6
December -2.5°C 8.4°C 25

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Shangqiu Zone 8a 61 km Last frost 25 Mar First 16 Nov Huaibei Zone 8a 95 km Last frost 23 Mar First 15 Nov Fuyang Zone 8b 109 km Last frost 16 Mar First 19 Nov Suzhou Zone 8a 115 km Last frost 21 Mar First 17 Nov Xuzhou Zone 8a 144 km Last frost 24 Mar First 16 Nov Heze Zone 8a 154 km Last frost 25 Mar First 15 Nov Luohe Zone 8a 164 km Last frost 15 Mar First 18 Nov Kaifeng Zone 8a 169 km Last frost 22 Mar First 16 Nov