Archbold Biological Station, Biennial Report 1999-2000



Mark Deyrup, Archbold Invertebrate Ecologist, stands knee-deep in water on a sand road in southern Tract 18, Archbold Biological Station, 10 September 1999; photo by Nancy Deyrup.


Archbold Climate Information, Main Grounds Weather Station

Research Assistant: Nancy D. Deyrup

[ Biennial Contents | Biennial 97-98 | Climate ]

During 1999-00 Archbold precipitation illustrated extreme contrasts (see figs. below). In 1999, locally heavy summer rainfall flooded Archbold property (see photos, this page) and some nearby areas. Roads and residential areas about a mile south of the Main Building were underwater for months with Hicoria declared a disaster area. Total rainfall in 1999 was 60.10 inches, approximately 7 inches (13%) above the average annual rainfall of 53.18 inches (1932-00). Although 1999 started with several dry months, May, June, July, and September each exceeded monthly averages by about 2 inches, while August was 7 inches above average. During 2000, however, precipitation was remarkably low with every month (except April and September) below normal. The rainy season (May-September) only produced rainfall of 19.88 inches, or 44% of the average 35.77 inches for the season. Total rainfall for 2000 was only 27.31 inches, 51.4% of normal, making 2000 the driest year ever recorded at Archbold.

However, temperatures for the years 1999-00 were similar to each other and close to the average. The highest temperature for these 2 years was 100EF and each year had approximately 135 days of 90EF and above which is normal. The lowest temperature in the year 2000 was 20EF with 16 days at 32EF and below and in 1999 the lowest temperature was 24EF with 7 days of 32EF and below. The lowest temperature recorded for Archbold (1952-00) was 13EF in 1982.

Figures 1 & 2. Monthly precipitation (upper graph, Fig. 1) and cumulative precipitation (lower graph, Fig. 2) (inches) in 1999 and 2000 in comparison with the long-term average (1932-2000) at Archbold Biological Station.

Flooding in the flatwoods at Sinkhole Pond, Tract 30, Archbold Biological Station, on 27 Aug. 1999 after the exceptional rainfall of mid-summer. Normally the foreground is dry and the pond only extends to the line of grass in the middle distance. A staff gauge is in the left center of the pond; photo by Nancy Deyrup.

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