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40 , 515 structures in low risk areas , 5 , 241 in medium risk areas , and 7 , 512 in high risk areas . 1%W The corresponding exposure for each risk level is as follows . Structures in the low risk areas are valued at $4 . 9 billion , structures in the medium risk areas are valued at 790 million , and structures in the high risk areas are valued at $ 1 . 1 million . Table 4 . 21 illustrates the average annual loss due to wildland fire by structure type in the County . Table 4 . 21 . Average annual loss due to wildland fire , Indian River County , 2004 , Rank Structure Type Average Annual Loss 1 . Single-family $47 , 554 2 , Orchards , Grove , Citrus $ 17 , 599 3 . Condominia $ 15 , 06 4 , Grazing Land Soil Class I $4 , z , 04 5 . Regional Shopping Mall $423102 Source : Florida Department of Community Affairs , 2004a . 4 . 1 . 7 Extreme Temperatures 4. 1 . 7. 1 Freezing Temperatures Hazard Identification. According to the U . S . Department of Agricu ture and Consumer Services , a moderate freeze may be expected every 1 to 2 years . Severe freezes may be expected on an average of once every 15 to 20 years . Freezes pose a major hazard ` W to the agriculture industry in Indian River County on a recurring basis , and are a significant threat to the economic vitality of the State's vital agriculture industry . Agricultural lands represent nearly one-half of all land in Indian River County ( University of Florida , 2001 ) . Historic Events. Indian River County has experienced seven signi icant freezes between 1970 and the present. Florida has experienced a number of severe or disastrous freezes , when the majority of the winter crops are lost . The lowest temperature ever recorded in the state of Florida is -2 ° F ( NCDC , 1999a ) . Since December 1889 , there have been at least 22 recorded severe freezes ; the most recent being in 1996 , when a Presidential Disaster Declaration was issued for crop losses exceeding $90 billion . During this event, there was extensive loss of citrus trees , and the majority were not replanted . Freezes in January of 1977 had severe impacts on agriculture around the state . A U . S . [Department of Agriculture report indicated the following crop loss : citrus — 35 % , vegetables 95 %- 100 % , commercial flowers — 50% -75 % , permanent pasture land — 50 % , and sugar cane — 40% . In addition , there was a severe loss to the tropical fish industry . It is estimated the freeze cost the Florida economy $ 2 billion in 1977 dollars ( NWS , 1999a ) . There were no data available to document previous occurrences of severe freeze by jurisdiction . Because temperature extremes are hazards that are not bounded by geographic or topographic characteristics , there are no definite means to determine whether or not the extent of this hazard differs from jurisdiction to jurisdiction within Indian River County . 4. 1 . 7. 2 Extreme Heat Hazard Identification . Temperatures that remain 10 ° or more above the average high temperatur;; for a region and last for several weeks are defined as extreme heat ( FEMA , 4-41