CONCORD WASTEWATER PLAN, CALIFORNIA

Monthly Total Heating Degree Days

(041967)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
Months with 5 missing days or less use mean for missing day(s)
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1991 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 71.00 239.50 531.50 842.00
1992 576.50 254.00 236.00 78.50 6.50 8.00 0.00 0.00 0.00 13.50 265.50 538.00 1976.50
1993 547.00 394.50 195.50 158.50 34.50 18.50 0.00 0.00 4.50 21.00 324.00 543.00 2241.00
1994 491.00 408.50 223.00 130.50 57.50 3.50 0.00 0.00 0.00 51.50 451.50 582.50 2399.50
1995 380.00 298.50 332.50 182.50 92.50 24.00 0.00 0.00 0.00 23.50 141.50 347.00 1822.00
1996 449.50 280.00 230.00 130.00 32.00 3.50 0.00 0.00 1.00 93.00 255.00 368.50 1842.50
1997 464.50 304.50 191.50 105.50 10.50 0.50 0.00 0.00 0.00 69.50 233.00 515.50 1895.00
1998 430.00 374.00 267.00 216.50 173.00 26.50 0.00 z 0.00 13.50 82.00 301.00 581.50 2465.00
1999 525.50 395.00 379.50 199.00 106.95 a 27.93 a 2.00 0.00 0.52 a 32.50 204.50 447.50 2320.90
2000 388.50 323.14 a 243.00 112.50 0.00 z 13.00 3.50 2.50 2.50 81.12 a 393.50 457.50 2020.76
2001 536.00 383.00 195.00 236.00 10.50 0.50 1.50 0.00 0.50 32.00 230.00 461.90 a 2086.90
2002 541.50 332.00 325.50 181.50 84.50 9.00 0.00 4.00 9.00 78.00 240.50 420.00 2225.50
2003 395.00 353.00 215.50 272.00 83.00 11.50 0.00 0.00 0.00 19.00 345.50 442.00 2136.50
2004 484.00 360.00 118.50 119.50 22.50 0.00 0.00 0.00 7.50 115.50 316.50 471.50 2015.50
2005 541.50 285.00 214.50 177.00 53.00 18.50 0.00 0.00 12.00 46.00 223.50 388.00 1959.00
2006 422.50 305.00 406.50 201.50 36.00 8.00 0.00 0.00 11.50 78.00 269.50 490.50 2229.00
2007 545.00 335.00 180.00 129.00 51.50 6.50 0.00 1.50 10.00 100.00 250.00 520.50 2129.00
2008 531.00 373.50 285.50 199.00 63.00 4.50 2.00 0.00 6.67 c 27.50 229.00 534.00 2255.67
2009 469.00 383.00 277.00 182.00 36.50 20.36 b 0.00 0.00 b 5.00 89.50 308.50 549.50 2320.36
2010 482.00 305.50 275.50 246.00 110.00 9.31 a 2.00 0.50 1.00 85.50 299.50 421.00 2237.81
2011 522.50 410.00 322.40 a 172.50 115.22 a 43.33 c 4.65 a 0.00 b 0.00 57.87 a 341.00 485.15 a 2474.62
2012 452.08 a 336.09 a 316.50 171.50 33.50 17.88 d 1.19 e 1.50 l 2.00 i 85.00 278.50 511.50 2203.75
2013 631.00 431.00 274.50 5.50 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 24.50 z 1336.50
Period of Record Statistics
MEAN 491.16 346.56 259.31 171.48 60.63 13.09 0.84 0.43 4.06 61.48 279.14 482.18 2142.62
S.D. 65.06 48.44 69.17 49.59 43.08 11.05 1.36 1.05 4.74 30.25 67.48 66.02 191.04
SKEW 0.02 -0.09 0.25 0.09 0.88 0.99 1.51 2.51 0.74 -0.14 0.58 -0.39 -0.16
MAX 631.00 431.00 406.50 272.00 173.00 43.33 4.65 4.00 13.50 115.50 451.50 582.50 2474.62
MIN 380.00 254.00 118.50 78.50 6.50 0.00 0.00 0.00 0.00 13.50 141.50 347.00 1822.00
NO YRS 22 22 22 21 20 21 20 20 21 22 22 22 18