PHENOLOGY OF FOREST TREES AT LINCOLN, NEBRASKA. 



R. D. Garver, Forestry Student. 



The weather conditions during the spring of 1909 were decidedly 

 abnormal and resulted in a retarding of forest growth for a considerable 

 period of time. During the month of March the normal temperature is 36o 

 F., but in 1909 this month showed a total of 18o F., above normal which 

 would give a daily average of thirty-six and eighteen thirty-firsts of a 

 degree. The first week was characterized by an unusually high tem- 

 perature and the rest of the month by a temperature which ranged 

 a trifle below normal except for an occasional warm day. The precipi- 

 tation was .95 of an inch of which .41 was snow. The weather was 

 cloudy about two-thirds of the time, the only clear day occuring in the 

 first part of the month. The prevailing direction of the wind was from 

 the northwest and attained an average velocity of 11.3 miles per hour, 

 which is a little below the average for this month. 



The month of April shows the greatest divergence from the normal 

 trend of the weather. This month shows a total decrease of 132o below 

 normal, the normal temperature being 50. 6o. The weather throughout 

 the month was unsettled and alternated between 22o below normal and 

 80 above, but the larger part of the time it was below. The average 

 temperature was 4.4o below normal for each day. The precipitation 

 equalling 1.08 inches was a litle below the average even though there 

 were very few clear days and quite an amount of cloudy, misty weather. 

 The prevailing direction of the wind was from the north and the average 

 hourly velocity was 14.3 miles. 



In May there was somewhat similar weather but it was not so 

 pronounced. The month shows a total deficiency of 78o F. below normal, 

 the normal temperature being 62.9<>. The first few days of the month 

 were unusually cold, the temperature alternating below and abo\e noimal 

 until the middle of the month, and from then on the temperature was 

 below normal, except three days which gave an average temperature 

 of 20 above normal. The average temperature for the month was two 

 and sixteen thirty-firsts degrees below normal. The rainfall amounted 

 to 5.63 nches which is a little above the average. The prevailing direction 

 was from the southeast with an average velocity of 11.5 miles per. hour. 

 The weather was very cloudy and there occurred only five clear days. 



The following is a list of the trees noticed and the dates of their 

 phenology: 



Boxelder (acer negundo) 

 April 13, small leaves 



Cottonwood (populus sargintii) 

 April 15, buds swelling 



