2012 Climate Summary for Rock Springs
Sweetwater County Airport
  • Warmest Year on Record (1948-2012)
    • Warmest March and August on Record
    • 7 of 12 Months in the Top Four Warmest on Record
    • 9 of 12 Months in the Top Seven Warmest on Record
  • Driest Year on Record
    • Driest June, August and September on Record
    • 7 of 12 Months in the Top Six Driest on Record
Temperature °F   Wind   Precipitation  
 
Temperature °F
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Average High 37.4 34.4 53.0 60.0 68.9 83.0 87.0 86.2 75.3 57.3 47.4 28.9 59.9
 Normal Average High (1981-2010) 30.3 33.2 43.9 53.7 63.8 74.8 83.8 81.5 70.3 56.5 40.4 29.8 55.3
 Average Low 18.2 16.6 27.7 32.4 38.6 48.4 56.9 56.1 46.2 32.2 26.8 13.6 34.5
 Normal Average Low 12.5 14.8 23.1 29.4 37.7 46.4 54.0 52.2 42.7 32.3 21.2 12.5 31.7
 Average Temperature 27.8 25.5 40.3 46.2 53.8 65.7 72.0 71.2 60.7 44.7 37.1 21.2 47.2
 Normal Average Temperature 21.4 24.0 33.5 41.6 50.8 60.6 68.9 66.9 56.5 44.4 30.8 21.1 43.5
 Departure from Normal 6.4 1 .5 6.8
4.6
3.0
5.1
3.1
4.3
4.2
0.3
6.3
0.1
3.7
 Rank - Warmest to Coldest
  65 years of record
  (P.O.R 1948-2012)
 3   26  1     7   3   
 1    31  3  38  1 
 Highest Daily Maximum 49 44 72 79 83 94 95 92 82 75 62 50 95
 Date of Occurrence 5 22 31 23 21 24 1 8 4-6,9 2 1,7 1,2  7/1
 Lowest Daily Minimum 1 7 13 18 26 33 49 45 39 16  12 -10 -10
 Date of Occurrence 17 6 1,2 7 6 6,10 6,17 4 27 25,26 11 30 12/30
 Number of Days with:                          
    Maximum >= 90° 0 0 0 0 0 9 10 3 0 0 0 0 22
    Maximum <= 32° 8 9 2 0 0 0 0 0 0 3 3 20 45
    Minimum <= 32° 30 28 23 17 4 0 0 0 0  15 22 29  168
    Minimum <= 0° 0 0 0 0 0 0 0 0 0 0 0  5 5
 Record Highs Set or Tied 4  0 3 5 3 5 1 2 0 0 0 0 23
 Record Lows Set or Tied  0 0 0 0 0 0 0 0 0  0  0 0 0
 

Records set during 2012:

Temperatures (degrees F):

Top 5 Warmest Years in Rock Springs
Rank Year Average Temperature °F
1 2012 47.2
2 2003 45.3
2 1954 45.3
4 2007 45.0
5 1981 44.8
5 1977 44.8
 
    Number of Days with Maximum >= 90°
Rank Year Number of Days
1 2003 29
2 2002 25
2 2007 25
4 2012 22
5 1988 17
 
    Warmest Months of March on Record
Rank Year Average Temperature °F
1 2012 40.3
2 1986 39.7
3 2007 38.3
4 1972 37.9
5 1978 37.6
 
    Warmest Months of August on Record
Rank Year Average Temperature °F
1 2012 71.2
2 2003 70.7
3 2011 70.3
3 1969 70.3
5 1970 70.1

 
Max

January: 47 on the 3rd, 46 on the 4th, 49 on the 5th, 48 on the 12th.
March: 64 on the 16th (tie), 67 on the 25th 72 on the 31st (All-time record high for March and record high so early in the season).
April: 73 on the 10th (also record high so early in the season), 73 on the 11th, 76 on the 22nd79 on the 23rd, 78 on the 24th.
May: 76 on the 10th (tie), 80 on the 15th (tie), 83 on the 21st.
June: 87 on the 3rd (tie), 92 on the 4th (also record high so early in the season), 85 on the 8th (tie), 93 on the 25th, 91 on the 28th (tie).
July: 95 on the 1st.
August: 92 on the 8th (tie), 90 on the 17th.

Min:  

None.
 
 
Wind
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Average Speed (MPH) 14.4 13.4 13.6 12.2 11.9 11.9 8.0 8.7 7.5 12.0 9.9 10.5 11.2
 Maximum 3-sec Gust 56 68 63 58 62 63 60 52 45 62 56 58 68
 Direction (tens of degrees) 26 29 18 20 32 25  18 25 25 26 21 25 290
 Date of Occurrence 18 25 18 4 18 26 19  10 4 16  9 17 2/25
              
 
Precipitation
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Total (inches) 0.21 0.35 0.08 0.54 0.21 T 1.29 0.01 T 0.07 0.17 0.08 3.01
 Normal Precipitaton (1981-2010) 0.45 0.48 0.68 0.91 1.21 0.79 0.64 0.62 0.92 0.87 0.49 0.50 8.56
 Departure from Normal -0.24 -0.13 -0.60 -0.37 -1.00 -0.79 0.65 -0.61 -0.92 -0.80 -0.32 -0.42 -5.55
 Percent of Normal 47 73 12 59 17 0 202 2 0 8 35 16 35

 Rank - Driest to Wettest
  65 years (1948-2012)

18 29  
37  6   1  57  1   1   6  13    1 
 Greatest 24-HR Total 0.10 0.10 0.03 0.19 0.08 T 0.90 0.01 T 0.04 0.10 0.03 0.90
 Dates of Occurrence 23 28 29 2 2 NA 21 11 NA 7 18 8 7/21
 Number of Days with:                          
    Precipitation >= 0.01 4 4 4 6 4 0 4 1  0 3 2 5 37
    Precipitation >= 0.10 1 1 0 2  0 0  2 0  0 0 1 0 7
    Precipitation >= 1.00 0 0 0 0  0 0  0 0 0 0 0 0 0
Daily Precipitaton Records Set or Tied 0 0 0  0 0 0 1 0 0 0 0 0 1
             
Records set during 2012:

 Precipitation:

Driest Years on Record
Rank Year Precipitation (inches)
1 2012 3.01
2 1988 4.53
3 1974 4.54
4 2002 4.97

  

Driest Months of June on Record
 Rank  Year  Precipitation (inches)
 1  2012 Trace
 1  1956 Trace
 3 1977
0.03
 4 1980
0.06
 5 2002
0.08

  

Driest Months of August on Record
 Rank  Year  Precipitation (inches)
 1  2012 0.01
 1  1985 0.04
 3 1960
0.07
 4 1975
0.08
 5 1948
0.10
 5 1971 0.10

  

Driest Months of September on Record
 Rank  Year  Precipitation (inches)
 1  2012 Trace
 2 1974 0.02
 3 1951
0.05
 4 1952
0.07
 4 1980
0.07
 6 1953
0.08

 

One day Precipitation:

July:  0.90 on the 21st.
 
 
 


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