The July temperature of all the rest of the Ukraine is much higher than this. The July isotherm of +20°, like all the July isotherms of the Ukraine, runs in a northeast direction past the source of the Sbruch and the mouth of the Pripet, and the further we advance from this line towards the southeast, the hotter the summers we find. [90]On the lower Dniester and Dnieper the mean July temperature exceeds +23°. Following are a number of July means: Czernowitz +20.1°, Kiev +19.2°, Vovchansk +20.3°, Odessa +22.6°, Katerinoslav and Mikolaiv +23°, Luhan +22.4°, Tahanroh +22.8°. The strongest degrees of heat are +37° to +43°, and the mean annual maxima are +30.3° for Ternopil, +31.1° for Lemberg, +32.7° for Czernowitz, +32.1° for Kiev, +35.2° for Mikolaiv, +35.5° for Luhan. The duration of the heat period with temperatures of +20° and over is two months southeast of a line which runs near Kishiniv, Poltava and Kharkiv, one month southeast of the line of Mohiliv, Kaniv and Kursk. The total duration of the summer is only in the northwest of the Ukraine as short as three months; otherwise it is four, and on the Black Sea even four and a half. The autumn of the Ukraine is regularly very beautiful and comparatively warm. The month of October has a mean of temperature higher than the annual (Lemberg +8.5°, Ternopil +7.7°, Czernowitz +9°, Kiev +7.5°, Vovchansk +7°, Katerinoslav +9.7°, Luhan +8.4°, Odessa +11°, Mikolaiv +9.7°, Tahanroh +9.1°). But even in October the warm sunny days are followed by night frosts. The moist autumnal weather which begins the transition to winter lasts as much as two months in the northwest; beyond that, one to one and a half months. The mean date of the earliest frost is October 19th for Kiev, October 11th for Luhan, October 28th for Micolaiv, and November 10th for Odessa. A different position, climatically, is that of Crimea, the sub-Caucasian country, as well as the mountain islands of the Carpathians, the Yaila and the Caucasus. In the temperature conditions of Crimea and the sub-Caucasus country, the influence of their southerly location and the proximity of the sea is everywhere apparent. The mean temperature is everywhere higher than +10° (Simferopol [91]+10.1°, Sevastopol +12.2°, Katerinodar +12.1°). The winter is short and comparatively mild (January mean of Simferopol +0.8°, Sevastopol +1.8°, Katerinodar +2.1°, Stavropol -4.7°), but very variable. The degrees of frost are sometimes quite high (Sevastopol -16.9°, Stavropol -25.6° as absolute minima), but the frost period is short (one to two months). The spring begins in March with full force; in May follows the five-months’ summer. The July means are very high, especially in the sub-Caucasus country, the heat period lasting everywhere more than two months. (July mean of Simferopol +28°, Sevastopol 33.1°, Stavropol +20°, Katerinodar +25.3°). The long autumn also is very mild.