University of Colorado ATOC Weather Network

CU-Boulder Monthly Weather Statistics

Month Temperature (F) Dewpoint (F) Wind (mph) Mean Solar Rainfall
Mean Min Max Mean Min Max Mean Max (W/m2) (inch)
May 2005 62.3 38.2 93.2 37.1 18.3 52.7 3.4 43 0.0 1.38
June 2005 67.7 44.3 93.6 42.3 17.4 60.4 4.2 46 111.4 1.36
July 2005 79.1 55.7 103.1 43.1 24.2 59.7 3.2 43 264.9 0.30
August 2005 72.0 51.0 95.4 45.1 14.9 64.4 3.2 39 206.4 1.10
September 2005 67.8 42.6 92.3 37.9 17.6 54.4 3.1 40 184.5 0.26
October 2005 54.1 32.2 87.0 33.2 9.6 51.4 2.6 32 134.0 2.45
November 2005 46.4 17.7 76.5 16.7 -5.6 38.0 3.9 56 110.7 0.23
December 2005 34.8 -2.8 66.9 11.8 -13.0 32.9 4.4 56 79.6 0.18
January 2006 41.9 20.3 66.6 12.0 -9.6 35.5 5.1 55 101.5 0.29
February 2006 35.3 -9.6 75.1 9.3 -16.7 35.8 3.9 50 128.2 0.30
March 2006 40.3 16.9 73.0 18.5 -1.2 35.4 3.2 56 166.9 1.38
April 2006 55.7 26.4 83.6 21.7 -0.7 43.9 4.2 51 218.8 0.83
May 2006 63.6 33.2 94.3 32.5 7.7 49.3 3.8 47 245.2 0.74
June 2006 75.3 48.5 98.7 39.4 15.2 60.9 3.2 44 269.9 1.04
July 2006 77.2 54.8 104.4 48.3 26.8 66.2 3.0 33 236.5 2.30
August 2006 73.2 51.3 95.4 47.3 29.0 62.6 2.7 30 198.0 0.93
September 2006 60.5 38.2 87.0 35.7 12.6 55.9 3.0 42 181.9 0.76
October 2006 51.4 24.7 82.8 29.3 3.3 46.7 2.9 37 126.7 3.04
November 2006 44.1 7.0 76.8 19.8 -2.3 37.2 3.5 45 93.5 0.32
December 2006 36.4 10.4 68.8 17.9 0.6 33.5 3.1 40 75.7 1.38
January 2007 28.6 -0.6 61.5 12.0 -7.8 30.3 2.7 60 85.1 0.80
February 2007 35.8 -4.8 67.6 17.7 -12.2 34.0 3.0 55 125.1 0.26
March 2007 48.9 18.0 77.7 23.6 -12.4 46.3 3.3 36 159.4 1.60
April 2007 49.4 23.3 86.3 27.7 -2.5 46.8 3.2 49 197.0 1.79
May 2007 60.5 35.2 87.4 36.8 19.4 52.3 3.3 42 223.2 1.90
June 2007 71.4 39.9 100.7 40.0 16.0 59.8 3.3 61 256.1 0.45
July 2007 78.1 58.9 99.7 48.3 30.5 62.7 2.8 38 252.9 0.58
August 2007 76.1 56.2 101.0 49.4 27.2 66.0 2.6 34 219.2 1.72
September 2007 66.3 41.2 91.8 39.0 16.4 59.8 2.9 46 176.7 1.66
October 2007 55.8 29.8 84.1 28.7 6.7 49.4 3.2 42 146.1 1.14
November 2007 45.5 16.9 75.6 18.2 -6.5 35.4 2.9 51 98.7 0.29
December 2007 30.8 10.2 68.9 13.6 -10.7 35.4 3.1 51 74.1 1.00
January 2008 32.2 -0.4 63.5 8.7 -13.5 36.0 4.3 55 95.1 0.12
February 2008 37.3 14.6 64.0 15.6 -6.5 31.5 3.5 48 130.3 0.35
March 2008 42.3 17.0 74.9 16.6 -6.6 35.9 4.0 43 169.6 0.75
April 2008 49.9 21.3 83.2 18.2 -4.9 38.3 4.0 49 233.8 0.77
May 2008 58.8 31.6 87.6 31.8 9.7 54.0 3.4 46 231.2 2.43
June 2008 71.1 47.4 95.1 36.4 9.8 58.8 4.1 47 323.1 1.45
July 2008 79.5 58.3 103.1 41.6 9.9 60.7 2.9 39 248.9 0.07
August 2008 72.9 48.6 101.0 45.9 24.2 61.0 2.4 40 218.5 2.17
September 2008 63.6 43.3 89.5 39.6 23.2 57.2 2.7 37 184.3 1.28
October 2008 54.3 29.8 82.0 28.4 2.0 46.7 2.7 40 136.4 0.73
November 2008 47.1 23.2 77.4 19.8 -15.5 34.1 3.2 44 96.6 0.07
December 2008 32.7 -8.2 66.6 11.7 -16.2 30.3 4.3 61 74.1 0.63
January 2009 39.2 0.0 70.8 11.3 -12.8 32.9 4.5 56 92.2 0.30
February 2009 41.4 17.3 69.1 13.6 -11.9 32.7 3.8 57 144.7 0.13
March 2009 45.6 13.8 77.6 13.4 -7.8 34.3 3.8 46 188.6 0.69
April 2009 48.7 20.5 81.6 26.9 -5.7 43.1 2.9 38 185.1 3.99
May 2009 61.4 40.3 91.6 36.4 4.4 54.9 2.8 40 215.2 2.38
June 2009 65.3 44.8 93.4 45.3 21.7 61.0 2.7 42 211.7 1.79
July 2009 71.9 50.8 99.7 48.1 23.9 62.9 3.0 74 162.8 1.23
August 2009 73.1 52.6 98.7 44.7 17.7 59.1 3.1 44 227.4 0.29
September 2009 65.2 41.1 90.7 40.1 16.9 58.5 3.0 42 179.5 0.26
October 2009 43.6 24.0 83.1 28.4 10.1 45.4 2.6 44 112.4 1.23
November 2009 43.1 22.9 75.9 21.8 -10.3 35.2 2.8 34 96.6 0.59
December 2009 28.6 -3.7 58.7 11.6 -13.3 32.9 2.5 57 74.3 0.36
January 2010 34.9 0.9 61.3 16.4 -3.6 34.5 2.4 35 93.6 0.19
February 2010 31.9 9.9 51.3 16.9 2.9 32.9 2.4 29 113.5 0.67
March 2010 43.7 12.9 79.7 22.1 -3.7 36.9 3.1 31 175.4 2.02
April 2010 49.6 30.9 75.4 27.3 -8.1 47.3 3.6 48 206.4 3.53
May 2010 55.8 32.1 92.5 34.2 5.7 57.1 3.4 51 251.5 2.18
June 2010 70.3 47.3 97.8 45.9 9.5 63.0 3.0 31 247.0 2.83
July 2010 75.2 52.2 101.1 49.3 22.2 63.5 2.7 36 239.4 2.01
August 2010 74.9 55.5 95.8 46.3 20.8 62.9 2.9 36 221.7 0.92
September 2010 69.2 45.6 95.0 33.6 -19.0 57.3 3.1 39 214.3 0.16
October 2010 56.9 33.5 82.6 32.0 0.3 49.7 3.1 51 138.1 0.84
November 2010 41.8 19.0 77.3 19.2 -22.8 39.7 2.8 50 102.9 0.29
December 2010 38.7 5.6 64.9 18.5 -7.5 36.8 2.2 48 75.3 0.24
January 2011 35.6 0.7 65.6 15.1 -10.1 38.0 3.4 46 92.4 0.50
February 2011 33.7 -12.1 66.1 12.1 -21.0 36.4 3.1 51 130.7 0.48
March 2011 46.4 21.1 74.9 18.9 -10.0 38.9 4.1 51 175.4 0.20
April 2011 49.6 25.2 79.1 25.1 -18.2 45.7 3.8 48 206.0 1.90
May 2011 54.8 34.7 87.9 33.0 -13.2 54.0 2.8 51 201.6 3.64
June 2011 70.5 48.9 98.4 39.8 -2.7 57.8 3.3 37 263.4 1.01
July 2011 77.1 58.7 100.3 51.7 27.1 67.2 2.7 30 249.0 2.70
August 2011 77.6 57.7 98.2 46.8 8.9 62.5 3.1 37 226.8 0.82
September 2011 65.7 44.5 92.2 39.6 17.7 57.4 2.7 24 185.7 2.17
October 2011 55.1 23.1 85.9 28.8 -4.4 48.8 2.7 35 150.9 0.93
November 2011 44.1 22.2 70.2 16.5 -39.7 35.3 3.5 59 107.5 0.47
December 2011 33.4 4.7 62.0 16.8 -3.4 33.9 2.6 65 82.3 1.00
January 2012 41.1 11.6 69.6 14.2 -8.1 32.2 4.5 66 86.1 0.20
February 2012 33.4 11.6 62.1 16.0 -17.0 35.5 3.2 63 126.9 0.93
March 2012 53.5 22.4 84.1 15.2 -31.7 40.1 4.1 50 196.1 0.00
April 2012 56.6 32.3 85.4 27.9 -33.5 49.3 3.4 43 232.1 0.90
May 2012 62.4 37.6 90.0 31.8 -9.3 54.5 3.1 42 239.9 1.25
June 2012 77.1 52.6 103.8 37.3 -5.9 58.8 3.0 40 268.1 0.24
July 2012 77.4 59.3 101.1 50.1 20.4 64.7 3.2 43 236.9 3.51
August 2012 75.9 51.5 96.8 43.4 23.2 63.5 3.0 32 217.6 0.50
September 2012 67.5 47.5 92.6 37.5 13.6 57.6 3.1 31 185.9 1.92
October 2012 51.6 27.0 86.6 28.1 -5.6 45.3 2.4 39 118.3 1.13
November 2012 47.9 19.7 75.3 21.8 -12.9 37.8 2.6 39 95.0 0.24
December 2012 36.3 8.2 70.1 13.5 -11.3 33.0 2.6 42 78.1 0.29
January 2013 35.9 1.3 66.3 10.4 -39.5 37.4 2.6 40 94.4 0.16
February 2013 34.4 13.8 61.4 14.0 -10.1 33.8 2.6 36 121.0 0.64
March 2013 41.9 11.6 75.3 21.4 -33.9 37.7 2.8 44 167.4 1.07
April 2013 44.6 7.8 78.3 24.2 2.6 40.1 2.5 48 190.3 3.09
May 2013 60.0 22.7 89.0 34.0 4.4 50.7 3.2 40 244.6 1.70
June 2013 72.7 46.7 99.0 41.0 -7.2 63.7 2.6 37 262.6 0.54
July 2013 74.5 57.2 100.2 51.4 20.8 64.4 2.5 35 242.7 1.17
August 2013 74.5 54.6 99.2 49.1 26.8 63.6 3.2 34 205.2 1.08
September 2013 66.4 38.7 96.5 47.0 16.5 62.7 3.0 47 161.2 14.72
October 2013 49.5 30.9 79.8 31.6 10.5 47.6 3.2 49 134.5 1.83
November 2013 44.6 15.4 69.5 20.5 0.2 34.7 3.4 49 106.6 0.18
December 2013 33.8 -3.0 67.2 12.3 -11.5 31.6 3.5 53 88.7 0.27
January 2014 34.7 2.2 61.2 15.3 -3.3 35.3 4.3 50 77.4 0.90
February 2014 32.3 -6.6 66.8 15.5 -13.8 36.1 4.1 59 124.4 0.34
March 2014 43.8 6.8 73.8 16.0 -22.4 35.9 4.1 46 170.3 1.08
April 2014 51.6 19.6 77.7 24.9 -3.4 46.6 3.9 38 205.5 1.47
May 2014 59.0 31.9 91.0 36.4 -8.3 60.8 3.1 34 209.5 4.04
June 2014 68.7 41.6 93.8 42.1 12.6 61.4 3.3 36 267.2 0.98
July 2014 74.2 55.2 99.9 50.8 30.2 65.7 3.1 30 225.4 3.65
August 2014 71.6 54.0 93.1 47.6 25.6 61.0 3.4 39 212.1 1.41
September 2014 65.6 33.5 95.5 44.4 25.9 61.0 2.8 30 179.9 1.77
October 2014 57.5 34.8 82.6 31.9 10.7 51.5 3.3 34 147.7 0.93
November 2014 40.1 -3.1 73.9 16.6 -11.0 40.6 3.4 47 83.8 0.20
December 2014 35.3 -7.2 64.5 16.7 -14.7 36.6 2.5 46 72.0 0.73
January 2015 38.5 5.2 73.3 19.4 -34.0 34.3 3.0 50 81.0 0.34
February 2015 37.7 5.9 74.2 19.3 -4.4 34.5 3.1 44 113.8 2.22
March 2015 48.2 10.9 82.4 22.0 -7.7 41.8 3.5 45 182.7 0.18
April 2015 51.2 29.1 81.6 29.0 -13.6 48.6 3.0 33 194.1 3.34
May 2015 53.7 29.8 87.3 41.5 23.8 53.8 2.4 29 162.3 5.59
June 2015 71.6 54.3 97.2 49.8 27.1 62.4 3.1 28 247.3 1.34
July 2015 73.2 55.6 94.9 49.7 22.3 67.9 3.3 36 232.2 2.03
August 2015 74.9 47.5 97.3 46.3 9.9 62.1 3.0 30 217.6 0.28
September 2015 70.9 46.1 91.5 39.2 15.2 59.0 3.7 37 202.2 0.15
October 2015 57.4 35.3 87.6 37.3 9.5 54.0 2.6 42 127.3 1.48
November 2015 41.6 11.9 75.4 20.3 -5.5 40.7 3.3 50 103.4 1.06
December 2015 35.0 12.3 67.4 15.6 -18.4 32.2 3.1 41 75.6 0.62
January 2016 36.6 13.0 63.8 16.3 -16.8 33.5 2.6 45 98.6 0.30
February 2016 42.9 14.8 72.2 17.4 -17.7 39.5 4.1 56 139.4 0.74
March 2016 44.4 20.5 74.3 22.2 1.5 40.8 3.6 46 156.4 2.70
April 2016 50.3 28.3 79.5 29.9 10.3 42.5 3.9 48 194.8 2.32
May 2016 56.7 31.1 82.5 38.0 17.7 54.5 3.1 31 213.1 1.47
June 2016 74.1 49.6 102.1 46.8 17.9 64.9 3.4 30 271.8 1.62
July 2016 76.9 58.6 100.1 47.8 20.8 64.0 3.0 37 250.5 0.71
August 2016 71.9 47.6 97.0 45.2 18.7 62.2 3.2 33 215.9 0.85
September 2016 66.5 42.9 90.4 40.3 17.8 58.7 3.3 32 190.8 0.48
October 2016 60.2 34.6 83.7 29.5 11.5 46.6 4.0 40 153.4 0.36
November 2016 49.1 22.6 79.2 21.8 -21.6 40.9 3.1 40 109.4 0.32
December 2016 32.6 -0.5 66.7 13.8 -19.8 34.8 3.5 53 75.8 0.56
January 2017 34.4 3.0 61.7 16.9 -5.7 36.1 3.2 47 83.0 0.85
February 2017 43.9 15.1 74.1 18.4 -12.2 35.9 3.9 60 122.5 0.30
March 2017 51.2 26.2 81.2 22.5 -10.6 41.7 3.8 64 161.4 0.98
April 2017 51.0 26.1 79.5 28.0 -2.8 47.2 3.5 40 218.1 1.76
May 2017 57.7 33.3 87.7 37.4 16.3 52.4 3.1 45 231.2 4.97
June 2017 71.8 49.3 98.4 43.0 -2.5 62.7 3.5 39 265.2 0.26
July 2017 76.6 56.3 100.7 49.4 28.4 63.2 3.0 30 232.0 1.01
August 2017 71.1 53.9 93.8 47.4 27.0 61.7 3.1 34 202.3 1.32
September 2017 64.9 43.0 97.6 41.0 12.5 53.3 2.8 30 162.1 1.62
October 2017 52.0 24.8 82.1 27.9 -4.9 50.8 3.7 45 141.6 1.84
November 2017 47.8 24.9 74.6 25.6 -11.3 39.6 3.2 53 100.2 0.53
December 2017 36.9 6.0 66.5 12.8 -10.9 32.3 3.2 48 86.1 0.50
January 2018 38.9 7.5 67.9 16.6 -2.9 36.9 3.0 49 89.5 0.32
February 2018 32.9 -0.4 64.4 15.6 -6.8 35.8 3.5 45 121.6 0.52
March 2018 44.9 23.4 71.9 20.5 -8.7 38.1 3.7 50 189.5 1.78
April 2018 49.9 23.4 81.9 24.5 -15.8 47.3 3.7 53 207.9 1.23
May 2018 62.1 37.7 90.7 41.9 14.9 56.5 2.9 30 211.1 3.59
June 2018 73.1 52.0 102.2 41.0 5.5 62.0 3.4 48 251.3 1.57
July 2018 75.4 52.6 99.3 50.1 23.4 68.3 2.9 37 249.6 1.68
August 2018 73.2 51.3 93.6 45.7 22.6 63.1 3.1 47 217.3 0.25
September 2018 68.3 39.9 95.2 38.2 7.8 58.3 3.2 39 189.3 0.88
October 2018 49.9 19.5 80.6 33.1 12.6 50.7 3.0 30 124.2 1.80
November 2018 40.6 17.7 62.8 20.6 -9.9 38.5 3.9 45 106.0 0.90
December 2018 35.7 7.8 60.2 13.7 -10.5 29.3 2.9 42 86.5 0.11
January 2019 36.7 5.1 61.6 18.0 -8.1 32.9 3.6 48 101.3 1.03
February 2019 31.0 -1.5 62.5 14.8 -8.1 31.2 3.2 54 127.8 0.28
March 2019 38.4 1.0 75.9 22.1 -11.0 39.6 2.7 48 170.7 1.92
April 2019 51.3 19.3 79.4 30.2 12.2 45.4 3.3 46 192.8 1.19
May 2019 52.0 32.2 82.0 34.0 16.3 51.3 2.9 28 176.1 2.00

CU-Boulder weather archive