Silvan, Diyarbakır Province, Turkey

Frost dates for Silvan

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

26 March

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

Median first autumn frost

30 November

The far end of the outdoor season.

Frost-free season

249 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 4 Mar 26 Mar 10 Apr 14 Feb 21 Apr
First of autumn 8 Nov 30 Nov 14 Dec 4 Nov 24 Dec
Frost-free days 285 249 212 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 12 Feb 6 Mar 29 Mar 30 Jan 11 Apr
First of autumn 19 Nov 9 Dec 24 Dec 12 Nov 31 Dec
Frost-free days 315 279 235 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 27 Jan 19 Feb 20 Mar 19 Jan 6 Apr
First of autumn 26 Nov 18 Dec 25 Dec 23 Nov 27 Dec
Frost-free days 332 302 250 1 of 30 years saw none at all

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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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 -2.1°C 6.8°C 21.5
February -0.9°C 9.1°C 15.4
March 3°C 13.8°C 6
April 7.9°C 19.8°C 0.4
May 12.9°C 26.4°C 0
June 18.3°C 34.6°C 0
July 22.9°C 39.6°C 0
August 23.1°C 39.1°C 0
September 18.5°C 33.4°C 0
October 12.5°C 25.4°C 0
November 5.1°C 16.3°C 2.6
December 0.2°C 9.6°C 12.8

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Batman Zone 8a 30 km Last frost 26 Mar First 30 Nov Bismil Zone 8a 45 km Last frost 27 Mar First 28 Nov Diyarbakır Zone 8a 74 km Last frost 29 Mar First 26 Nov Muş Zone 6b 78 km Last frost 14 Apr First 5 Nov Siirt Zone 7b 85 km Last frost 26 Mar First 30 Nov Midyat Zone 8a 85 km Last frost 27 Mar First 30 Nov Bingöl Zone 6a 94 km Last frost 6 May First 26 Oct Mardin Zone 8a 95 km Last frost 28 Mar First 27 Nov

Seasonal context

Rainfall and the growing season in Silvan

March has the highest average precipitation (78 mm); August has the lowest (1 mm). Compare this pattern with the planting windows and your water supply.

Jan 75 mm
Feb 77 mm
Mar 78 mm
Apr 77 mm
May 47 mm
Jun 10 mm
Jul 2 mm
Aug 1 mm
Sep 8 mm
Oct 43 mm
Nov 55 mm
Dec 77 mm

During wetter months, check that beds and containers drain after heavy rain. During drier months, plan how you will keep seeds and new transplants watered. Monthly averages can hide long dry spells and intense storms; they do not show soil moisture, humidity or this week's weather.

Source: NASA POWER, corrected MERRA-2 precipitation, 2001–2020. Values are approximate monthly totals, including the water equivalent of snow, from the nearest 0.5° × 0.625° grid cell. This reference period differs from the temperature record. Rainfall provides context and does not change the calculated planting dates. Method and limitations.

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