Adjective : unseasonal April snows.    From Dictionary.com. 

Two years ago the trust was warning that "unseasonal" weather could start to spell disaster for many species of insects, birds and mammals.    From Wordnik.com.  [British wildlife benefits from return to 'traditional' seasonal weather] Reference

On Tuesday morning, there was an unseasonal frost.    From Wordnik.com.  [Another Roadside Attraction]

It scattered around him like unseasonal snowflakes.    From Wordnik.com.  [Whispers Of Betrayal]

Sharpe rubbed his hands against the unseasonal cold.    From Wordnik.com.  [Sharpe's Honour]

Start praying now for unseasonal balminess, will you?.    From Wordnik.com.  [shaken & stirred] Reference

Or in this case, I tagged it as “unseasonal advice”.    From Wordnik.com.  [How Do You Save on Heating Bills (and Keep Warm)? | Lifehacker Australia] Reference

Gusts slapped at his clothing, sharp with unseasonal frost.    From Wordnik.com.  [Stormwarden]

Winter storms or unseasonal hot spells were equally possible.    From Wordnik.com.  [Jackson's Woman]

I think we have had a bit of bad luck too — unseasonal rains.    From Wordnik.com.  [Wall Street Journal Interview] Reference

I tried to do as much during an unseasonal weekend in mid-March.    From Wordnik.com.  [You Really Like Me! (Or the Coat?)] Reference

Cape Town's unseasonal Friday morning rain pattered on President.    From Wordnik.com.  [ANC Daily News Briefing] Reference

This is seriously unseasonal, I know, but it was cold here last week.    From Wordnik.com.  [Odd Ducks] Reference

With a dark sky threatening an unseasonal downpour, I offered them a ride.    From Wordnik.com.  [A day in Oaxaca = Two thousand years, Part Two: Monte Alban and the Zimatlán Valley.] Reference

May I offer some unseasonal thoughts to fellow patriots as devil's advocate?.    From Wordnik.com.  [On Thursday, the Legg report will be published along with...] Reference

In spite of the unseasonal clearness of the predawn darkness, it was bitterly cold.    From Wordnik.com.  [The Silicon Mage]

She'd arrived the previous day, leaving rain and a chill, unseasonal breeze in England.    From Wordnik.com.  [The Tycoon's Mistress]

I cannot imagine that they would not bring it into an article but an unseasonal warm spell.    From Wordnik.com.  [This global warming is a right bitch] Reference

Here in the South west we have no snow - but we do have a unseasonal invasion of bluebottles!.    From Wordnik.com.  [Blair Leaving Party] Reference

It was such an unseasonal miracle rainfall that the desert was blanketed with bright flowers.    From Wordnik.com.  [An abundance of rain] Reference

The sun is continuing to hit Edinburgh with unseasonal warm weather in June? how absurd fervour.    From Wordnik.com.  [Edinburgh Film Festival 2010: Day 4 (Whisky With Vodka; The Extra Man) | Obsessed With Film] Reference

A year ago an unseasonal spring brought a frost that killed back the six inches of soft new growth.    From Wordnik.com.  [Northern Nut Growers Association Report of the Proceedings at the Thirty-Seventh Annual Report Wooster, Ohio, September 3, 4, 5, 1946] Reference

What Londoners and Brummies are now experiencing is an unseasonal outbreak of a less dangerous flu.    From Wordnik.com.  [Behind the swine flu panic] Reference

The freakish weather maintained its reputation by following the storm with an unseasonal warm front.    From Wordnik.com.  [The Sinister Six Combo]

It started with the curiously unseasonal weather, which plunged London into darkness one July lunchtime.    From Wordnik.com.  [John Rentoul today puts Trevor Kavanagh and myself in the...] Reference

Officials described the unseasonal snow falls as the heaviest recorded in November for more than five years.    From Wordnik.com.  [ANC Daily News Briefing] Reference

Hikers were airlifted out of the Drakensberg when they got caught in unseasonal snowdrifts of up to 1,5m deep.    From Wordnik.com.  [ANC Daily News Briefing] Reference

In the unseasonal car, with its powerful air-conditioning switched off and sunroof closed, we started for home.    From Wordnik.com.  [Middlesex]

Crops in 28236.23 hectares have been destroyed in the unseasonal rains, resulting in a loss of Rs 109.54 crore.    From Wordnik.com.  [Two More Die in Lightning in Kerala, Toll Reaches Thirteen] Reference

Fruit farmers complain of mildew on grapes from unseasonal rains and of unduly hot spells robbing apples of moisture.    From Wordnik.com.  [ANC Daily News Briefing] Reference

It is too early to think about planting out summer bedding, despite the nurseries flaunting it in ranks of unseasonal colour.    From Wordnik.com.  [The first taste of spring – at last] Reference

It would have been easy without the unseasonal rains that fell, and we could have surpassed the goal by perhaps 200,000 tons.    From Wordnik.com.  [SPEECH TO 5 CONST. BRIGADES OF THE BLAS ROCA CON] Reference

There were no ice flows in the Penguin Bay bukta on arrival, but the danger of ice breaking off the ramp because of unseasonal.    From Wordnik.com.  [ANC Daily News Briefing] Reference

The unseasonal warmth of Llordian was fading into normal early winter -- wet, cold, and raw -- still preferable to the mustiness.    From Wordnik.com.  [Timegod's World]

Lowveld traffic head Eddy Britz warned motorists in the Tzaneen district to beware of landslides caused by soaking unseasonal rains.    From Wordnik.com.  [ANC Daily News Briefing] Reference

Pushing her bike up Olive Way, her tears threatened to refill the puddles that the unseasonal November sunshine had been evaporating.    From Wordnik.com.  [La insistencia de Jürgen Fauth] Reference

Use effective mulches on cover crops to protect the soil surface from intense sunlight, wind erosion and the occasional unseasonal rains.    From Wordnik.com.  [Chapter 8] Reference

The unseasonal rains also affected the prospects of cash crops like pepper and coffee, especially in areas of Wayanad and Idukki districts.    From Wordnik.com.  [Heavy Rains Lash Kerala, Claimed Four Lives and Inflicting Huge Agricultural Loss] Reference