The air temperature during so-called cold gardeners period in the Lublin district [Poland]
2004
Kolodziej, J. | Liniewicz, K. | Bednarek, H.,Akademia Rolnicza, Lublin (Poland). Katedra Agrometeorologii
The paper presents the materials which were gathered between 1951 and 2000 concerning four days of May (12-15), that is the period called cold gardeners. Between 1951-2000 the minimum sub-zero temperature at the height of 5 cm occurred within eight years in thirteen cases, that is with the frequency equal to 6.5 percent. Mostly, i.e. in six years, the minimum sub-zero temperature was noted on 13th May. At the height of 200 cm above the ground the minimum sub-zero temperature was noted during three years, mostly-twice-also on 13th May. The lowest minimum sub-zero temperature that was ever determined in the analysed period is - 4.6 deg C near the ground on 13th May 1978. At the height of 200 cm the lowest temperature - equal to 1.7 deg C - was noted on 14th May 1980. The values of minimum temperature at the height of 5 cm, which were noted mostly, fit in two classification divisions (4-6 and 6-8 deg C). 50 and 37 cases were noted, which means the frequency of 43.5 percent in the test of 200 repetitions. At the height of 200 cm the most numerous values of minimum temperature were noted in four classification divisions. These records occurred 123 times (61.5 percent of the whole test), mostly in the range of 6-8 deg C - in 36 cases. Among the most numerous values of day averages a shift towards higher temperature can be clearly seen. In five classification divisions 82 cases (41 percent of the test) were determined. The occurrence of extreme values of minimum temperature clearly depended on the type of air masses which were above Poland in a particular situation. When the lowest temperature occurred the presence of arctic masses (sea or old) was ascertained, the occurrence of the maximum temperature was connected with polar (mostly sea masses) and even tropical masses
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