A HISTORY OF HERTFORDSHIRE TABLE III SEASONAL RESULTS OF CLIMATOLOGICAL OBSERVATIONS, 1887-98 Temperature of the Air Hu- Rain Seasons Means Extremes midity Cloud, Mean Min. Max. Range Min. Max. Per O IO Amount Days deg. deg. deg. deg. deg. deg. cent. ins. Spring . . . 46-6 37'5 55-6 18-1 9-0 86-6 79 6-5 5-03 39 Summer . . . 60-2 50-4 70-0 19-6 29-0 94'5 75 6-6 6-93 40 Autumn . 49-2 41-8 56-6 14-8 I5-0 91-8 86 6-6 7-29 45 Winter . . . 37-2 317 42-7 I I'O 1-0 65-3 89 7-2 5-04 44 TABLE IV MONTHLY RESULTS OF CLIMATOLOGICAL OBSERVATIONS, 1887-98 Temperature of the Air Hu- Rain Months Means Extremes midity Cloud, Mean Min. Max. Range Min. Max. Per O-IO Amount Days deg. deg. deg. deg. deg. deg. cent. ins. January . 36-1 31-1 41-1 IO'O 4-0 59-8 9 7'5 62 16 February . . 377 31-5 43'8 I2'3 I'O b5'3 7 7-0 '3 1 12 March . 41-2 33'4 49.0 I 5 -b 9-0 68-0 83 67 '95 15 April. . . . 46-2 36-7 557 19-0 17-8 82-9 ?8 6-5 '3 1 12 May .... 52-3 42-4 62-2 19-8 2 I'O 86-6 75 6-3 77 12 June .... 59-0 48-8 69-3 20-5 29'O 90-0 75 6-6 73 II July .... 6ro SI'S 70-8 19-5 34' 90-3 74 67 2-54 14 August . 60-6 51-1 70-0 18-9 33"! 94'5 76 6-4 2-66 15 September . 56-6 47-6 657 18-1 2 S -8 91-8 82 6-0 1-91 12 October . . . 48-0 40-6 55'4 14-8 16-0 74'3 87 6-4 2-89 17 November . 43' 37'3 48-7 11-4 15-0 64-0 90 7'5 2-49 16 December . 37'9 32-5 43'2 107 4'3 59-0 90 7-1 2'II 16 Year. . . . 48-3 40-3 56-2 15-9 I'O 94'5 82 6-7 24-29 168 In dividing the year into seasons, March, April, and May are con- sidered as spring ; June, July, and August as summer ; September, October, and November as autumn ; and December, January, and February as winter. Autumn is warmer than spring by 2*6, almost entirely owing to the colder nights in spring, but the excess of temperature of summer over that of winter is much more due to the warm days in summer than to the cold nights in winter. Spring is 9 '4 warmer than winter, and summer is 13 -6 warmer than spring; autumn is ii'o colder than summer, and winter is i2 - o colder than autumn. Thus the transition from spring to summer is the greatest, and that from winter to spring is the least. Autumn and winter are much more humid than spring and summer, but the rainfall is much greater in summer and autumn than it 38
