SEPTEMBER 1999
LINCOLN, NE

SEPTEMBER 1999 FINAL CLIMATE SUMMARY


 
Nebraska First Freeze Map
August 6-7 Record Flash Flood in Omaha
Lincoln First Freeze Graph
Temp. & Precip. Departures last 15 Months
AUG '99 Severe Storms Symposium Photos
AUG 1999 Climate Summary

Record Low of 32 F on September 21.

SEPT 99 MAX MIN MEAN DEP PCPN RMAX RMIN HDD CDD AVG MAX AVG MIN AVG Mean
09/01/99 93 69 81 +10 T 106 42 0 16 82 59 71
09/02/99
93
62
78
+8
0.00
 100 43
0
13
 82 58 70
09/03/99
92
67
80
+10
0.00
 102 35
0
15
 81 58 70
09/04/99
79
63
71
+2
0.86
 102 40
0
6
 81 58 69
09/05/99
75
54
65
-4
0.00
 103 43
0
0
 81 57 69
09/06/99
83
51
67
-2
0.00
 105 40
0
2
 80 57 69
09/07/99
92
67
80
+12
T
 104 42
0
15
 80 57 68
09/08/99
80
53
67
-1
0.00
 103 40
0
2
 80 56 68
09/09/99
76
46
61
-7
0.00
 102 36
4
0
 79 56 68
09/10/99
82
47
65
-2
0.00
 101 38
0
0
 79 55 67
09/11/99
74
55
65
-2
0.01
 99 29
0
0
 78 55 67
09/12/99
73
50
62
-5
T
 96 32
3
0
 78 55 67
09/13/99
71
45
58
-8
0.00
 102 34
7
0
 78 54 66
09/14/99
71
44
58
-8
0.00
 99 34
7
0
 78 54 66
09/15/99
72
38
55
-10
0.00
 99 31
10
0
 77 53 65
09/16/99
76
40
58
-7
0.00
 100 34
7
0
 77 53 65
09/17/99
76
50
63
-2
0.00
 101 35
2
0
 77 53 65
09/18/99
84
50
67
+3
0.00
 100 31
0
2
 76 52 64
09/19/99
69
55
62
-2
0.14
 98 29
3
0
 76 52 64
09/20/99
62
38
50
-14
0.07
 95 31
15
0
 76 52 64
09/21/99
69
32
51
-12
0.00
 101 35
14
0
 75 51 63
09/22/99
81
39
60
-3
0.00
 99 27
5
0
 75 51 63
09/23/99
86
50
68
+5
0.00
 97 31
0
3
 75 50 63
09/24/99
89
49
69
+7
0.00
 91 31
0
4
 74 50 62
09/25/99
86
58
72
+10
0.00
 93 29
0
7
 74 49 62
09/26/99
72
56
64
+3
T
 95 28
1
0
 74 49 62
09/27/99
68
48
58
-3
0.11
 94 32
7
0
 74 49 61
09/28/99
68
48
58
-3
0.03
 102 28
7
0
 73 48 61
09/29/99
66
36
51
-9
0.00
 92 26
14
0
 73 48 60
09/30/99
75
44
60
0
0.00
 94 28
5
0
 73 47 60
TOTAL 1.22 111 85
AVERAGE 77.8 50.1 64.0 81 90
NORMAL 77.2 53.2 65.3 3.48
DEPARTURE  +0.6 -3.1 -1.3 -2.26 +30 -5

 
From the record books:
Hottest recorded September  temperature, 106 F, September 1, 1922.
Coldest recorded September  temperature, 26 F,  September 29, 1984.
Earliest ever first snowfall, September 28, 1985, 0.8 inches.
90 F and 100 F Climatology located at
Lincoln's Historical Heat Waves (1887-1999)
1999 TOTAL PRECIPITATION:
  JAN   +   FEB   + MAR   + APR    + MAY  + JUN  +  JUL + AUG + SEP
   0.35 +   1.28  +   1.52   +  4.54   +  5.63  +  5.68 +  2.11 + 3.41  + 1.22=  25.74 in.
Normal Jan. 1 through Aug.  31 = 20.51 inches. 1999 Surplus as of Aug. 31 = 4.01 in. 

AVERAGE AND TOTAL are SEPTEMBER 1999.
NORMAL is the 1961-90 Standard Normals.
DEPARTURE is SEPTEMBER 1999 Average measured against 1961-90 normals.
MAX = Observed Maximum and MIN = Observed Minimum temperatures.
MEAN = Observed Mean Daily temperature.
DEP = Departure from normal ( __ = below normal, + above normal).
PCPN = Observed daily precipitation (midnight to midnight, CST).
RMAX = Record maximum temperature.
RMIN = Record Minimum temperature.
HDD = heating degree day units (base of 65 degrees).
CDD = cooling degree day units (base of 65 degrees).
AVG MAX = Daily Normal High Temperature (1961-90 normals).
AVG MIN = Daily Normal Low Temperature (1961-90 normals).
AVG MEAN = Daily Normal Mean Temperature (1961-90 normals).


  Earliest freeze, September 11, 1940 (Julian day 254)
  Latest freeze, November 7,  1956  (Julian day 311)
  Julian Dates:
  250 = September   7       280 = October   7     305 = November  1 
  260 = September 17       290 = October 17      310 = November  6 
  270 = September 27       300 = October 27

 
UNL
University of Nebraska-Lincoln
High Plains Climate Center

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