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Omaha 30-Year Averages (1971-2000)  
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual  
Avg High Temperature (°F) 31.7 37.9 50.4 63.2 73.7 83.7 87.4 85.2 77.3 65.2 47.8 34.8 61.5  
Avg Low Temperature  (°F) 11.6 18.0 28.1 39.6 50.7 60.6 65.9 63.8 53.5 41.1 28.1 16.4 39.8  
Mean Temperature  (°F) 21.7 28.0 39.3 51.4 62.2 72.2 76.7 74.5 65.4 53.2 38.0 25.6 50.7  
Avg Precipitation (in) 0.77 0.80 2.13 2.94 4.44 3.95 3.86 3.21 3.17 2.21 1.82 0.92 30.22  
Avg Snowfall (in) 6.3 5.9 4.5 1.2 ------ ------ ------ ------ ------ 0.3 3.4 5.5 27.1  
Avg Thunderstorm Days 0 0 2 5 8 9 9 6 4 2 0 0 45  
Gretna Averages (1997 - Present)  
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual  
Avg High Temperature (°F) 32.3 36.9 49.4 62.4 72.9 81.8 86.4 84.0 77.7 63.7 50.9 36.3 61.7  
Avg Low Temperature  (°F) 13.8 17.4 26.5 37.8 47.6 56.7 61.6 59.4 54.4 42.4 30.8 18.5 41.0  
Mean Temperature  (°F) 23.1 27.1 38.0 50.1 60.2 69.3 74.0 71.7 66.1 53.1 40.8 27.4 51.4  
Avg Precipitation (in) 0.79 1.43 1.95 3.41 4.44 4.79 3.70 4.10 2.61 2.96 1.42 1.16 32.18  
Avg Snowfall (in) 8.8 11.8 6.4 2.0 ------ ------ ------ ------ ------ 2.0 1.2 9.0 41.4  
Average Windspeed (mph) 7.8 7.6 8.7 9.0 8.2 6.8 5.7 5.5 6.7 7.4 7.8 7.9 7.5  
Avg Thunderstorm Days 0 1 2 5 9 10 9 7 4 3 1 0 51  
Gretna Monthly Records (1997 - Present)  
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual  
Warmest Average  (°F) 37.0 36.1 46.7 57.3 66.2 76.9 80.2 77.7 71.1 57.4 49.3 34.1 53.6  
Coldest Average  (°F) 17.4 20.5 31.2 46.4 57.1 68.3 71.4 70.4 61.6 46.4 32.1 14.2 49.3  
Warmest Anomaly   (°F) 15.3 8.1 7.4 5.9 4.0 4.8 3.5 3.2 5.6 4.2 11.3 8.5 2.9  
Coldest Anomaly   (°F) -4.4 -7.5 -8.1 -5.0 -5.1 -3.9 -5.3 -4.2 -3.8 -6.9 -5.9 -11.4 -1.4  
Warmest Day  (°F) 68 74 83 92 95 98 105 101 104 91 82 69 105  
Coldest Day  (°F) -15 -10 -10 17 29 44 51 46 35 3 7 -10 -15  
Wettest (in) 1.79 3.48 5.43 6.65 10.11 10.82 6.32 8.75 4.49 6.97 2.85 3.07 43.43  
Wettest Day (in) 0.79 2.68 1.75 2.42 2.26 2.98 3.27 3.18 2.88 2.21 2.49 1.04 3.27  
Driest (in) 0.19 0.09 0.59 1.40 1.08 1.32 1.25 0.95 0.62 0.03 0.06 0.02 22.20  
Most Snow (in) 22.7 21.3 20.5 10.9 ------ ------ ------ ------ ------ 14.0 7.0 31.5 57.4  
Snowiest Day (in) 14.0 10.5 12.3 7.5 ------ ------ ------ ------ ------ 12.0 3.5 12.5 14.0  
Least Snow (in) 0.1 1.8 0.0 0.0 ------ ------ ------ ------ ------ 0.0 0.0 0.0 18.8  
Highest Dewpoint (°F) 46 52 66 67 74 82 85 85 76 74 61 61 85  
Lowest Dewpoint (°F) -24 -20 -14 0 16 34 45 33 28 7 -4 -19 -24  
Highest Pressure (mb) 1051 1048 1045 1035 1032 1030 1027 1028 1031 1038 1041 1050 1051  
Lowest Pressure (mb) 988 990 988 985 984 986 1000 1000 987 985 985 990 984  
Highest Avg Wind (mph) 8.7 8.9 10.1 9.8 9.2 9.6 7.0 7.1 8.3 8.0 9.2 9.5 8.0  
Lowest Avg Wind (mph) 6.4 6.3 7.6 7.8 6.9 5.0 4.4 4.5 3.8 6.9 6.1 5.5 6.6  
Highest Wind Gust (mph) 54 75 59 51 62 63 62 52 55 55 52 55 75  
Most Thunder Days 2 2 7 12 14 16 14 12 6 7 4 2 60  
Least Thunder Days 0 0 0 2 5 4 6 3 3 0 0 0 41