Ground frost may also refer to the condition when the temperature of the upper layer of the soil falls below the freezing point of water.
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The three main types of ground frost are radiation frost (hoar frost), advection frost (advection hoar frost) and evaporation frost. The latter is a rare type which occurs when surface moisture evaporates into drier air causing its temperature at the surface to fall at or under the freezing point of water. Rime (both soft and hard) is technically not a type of ground frost.
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Air frost occurs frequently in the winter, with most areas seeing over 40 days of air frost every year. In northern areas, air frost occurs on average 10.2 days every January, the month in which air frost occurs most frequently. In the Sperrins and the Glens of Antrim air frost occurs around 80 days a year. The pattern is similar with ground frost, with on average around 100 days of ground frost in the lowlands and over 140 in the mountains.
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From 1906 to 1960 the Met Office practice was to base the number of days of ground frost on this criterion: a day with a minimum temperature reaching 30 °F (−1 °C), probably because 32 °F (0 °C) was not considered enough cold to cause damage to growing plants. Since 1961 the statistics have referred to the number of days with grass minimum temperature below 0°C. Occasionally, the term ground frost can still be seen, but it means simply a minimum temperature below 0 °C.
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The island has a Mediterranean climate with warm and dry summers, and wet and cool winters. Although summer is the driest season, some rainfall does occur in summer. Snow and ground frost are not uncommon in winter.
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There are on average 80 days of ground frost per year.Mean Number Of Days Of Ground Frost (from the NIWA website) Snowfalls occur on average three times per year, although in some years no snowfall is recorded. The coldest temperature recorded was on 18 July 1945, the third lowest recorded temperature of New Zealand's major cities. On cold winter nights, the surrounding hills, clear skies, and frosty calm conditions often combine to form a stable inversion layer above the city that traps vehicle exhausts and smoke from domestic fires to cause smog.
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During the southwest Monsoon season, the wind speed sometimes reaches gale force. Although some rain falls throughout the year, a dry season occurs from January–March. The ground frost is common in February. Mist can persist in the most of the day during the wet season.
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June, July and August are the months that present the largest variations of temperature, and during the morning frost in the higher terrains surrounding the savanna is possible. Sometimes also ground frost is present, which has a negative impact on agriculture. Hail is a relatively common phenomenon on the savanna.
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Spring is characterized by abundant sunshine and scattered showers. The temperature starts to rise markedly in April, highs usually reach the 25 °C mark at the end of the month, though short cold spells with lows in the 0–5 °C zone and ground frost may strike even in mid-May.
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In the mornings of the winter months of December to February, ground frost appears. The average annual rainfall ranges from 2000–2500 mm. The southwestern monsoon brings most of the rain from May to September, but the northeastern monsoon contributes a fair amount of rain as well. All of the island's major rivers arise in the central highlands, and montane rain forests act as the main catchment area.
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Agricultural fields of Punjab during the monsoon The geography and subtropical latitudinal location of Punjab lead to large variations in temperature from month to month. Even though only limited regions experience temperatures below , ground frost is commonly found in the majority of Punjab during the winter season. The temperature rises gradually with high humidity and overcast skies. However, the rise in temperature is steep when the sky is clear and humidity is low.
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Ligol Apple color depends on many factors, which include weather conditions at the time of fruit ripening, temperature fluctuations between the day and night cycles, good insolation, and the soil composition. Bicolored apples that grow in certain regions of Europe, such as Grójec, are also characterized by a slight note of sourness, which results from the specific weather conditions, namely the ground frost occurring in that area during the autumn crop collection.
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Apartaderos is a small Andean town in Mérida State, Venezuela. Ground frost in Apartaderos. Because its location in an alpine tundra ecosystem called páramo, they often undergo a sudden and drastic change in a daily freeze-and-thaw cycle, sometimes described as "summer every day and winter every night." Located at an altitude of , it is the highest town in Venezuela, surrounded by páramo vegetation, the town has tourism facilities such as restaurants, gift shops and small hotels.
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Quercus coccifera supports either drought summers and semi-desert climate with rainfall between 400 and 600mm, with a maximum in the fall and spring. In its habitat summers are hot and winters are cold with the dry summer season with more than 35 °C, occasionally reaching over 40 °C. In winter the temperatures often drop below 0 °C. It lives in areas with moisture produced by condensation fogs, many Ground frost on clear nights and sporadic snowfalls.
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There are various farms and associated buildings located throughout the island including Kinerarach and Tarbert in the north Ardailly in the west, where there are two holiday homes and a ruined watermill and North and South Druimachro on the east coast south of Ardmininsh. The climate is mild with higher than average sunshine hours and minimum temperatures, and lower than average days of ground frost for Scotland.Haswell-Smith (2004) pp. 37–41. Annual rainfall is typically between .
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The earthen plaster removed, exposing the adobe bricks at Fort St. Sebastian in France The ground supporting an adobe structure should be compressed, as the weight of adobe wall is significant and foundation settling may cause cracking of the wall. Footing depth is to below the ground frost level. The footing and stem wall are commonly 24 and 14 inches thick, respectively. Modern construction codes call for the use of reinforcing steel in the footing and stem wall.
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Along with the surrounding area of Snowdonia, the village has wetter and slightly cooler weather than lower areas of North-west Wales, this includes nearby areas such as Caernarfon and Anglesey. The annual mean temperature of Llanrug is 11 °C (52 °F).. The village's snowiest and coldest month of the year is January, with the mean temperature between 1 °C (32 °F) and 5 °C (40 °F). Ground frost can occur from late November into early April. Snow falls from early December into early April.
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The city's highest recorded temperature was on Australia Day 1940 at the Brisbane Regional Office, with the highest temperature at the current station being on 22 February 2004; but temperatures above are uncommon. On 19 July 2007, Brisbane's temperature fell below the freezing point for the first time since records began, registering at the airport station. The city station has never dropped below , with the average coldest night during winter being around , however locations directly west of Brisbane such as Ipswich have dropped as low as with heavy ground frost. In 2009, Brisbane recorded its hottest winter day (from June to August) at on 24 August; The average July day however is around with sunny skies and low humidity, occasionally as high as , whilst maximum temperatures below are uncommon and usually associated with brief periods of cloud and winter rain.
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