PART II: METEOROLOGY 
9. This section summarizes the meteorological measurements made during 
the current year and in combination with all previous years. Meteorological 
measurements during storms are given in Part IX. 
10. Mean air temperature, atmospheric pressure, and wind speed and 
direction were computed for each data file, which consisted of data sampled 
two times per second for 34 min every 6 hr beginning at or about 0100, 0700, 
1300, and 1900 hr eastern standard time (EST); these hours correspond to the 
time that the National Weather Service (NWS) creates daily synoptic weather 
maps. During storms, data recordings were made more frequently. 
Meteorological data are summarized in Table 2. 
Table 2 
Meteorological Statistics 
Mean Mean Wind Resultants 
Air Temperature Atmospheric Pres. Precipitation, mm 1991 1980-1991 
deg C mb 1991 1978-1991 Speed Direction Speed Direction 
Month 1991 1983-1991 1991 1983-1991 Total Mean Maxima Minima m/sec deg m/sec deg 
Jan 7.3 5.9 1018.2 1017.9 142 101 180 44 2.6 341 2.3 333 
Feb 7.8 6.8 1015.5 1017.5 8 72 113 20 2.0 306 1.7 342 
Mar 11.2 7 1009.4 1016.2 186 100 206 35 2.0 268 1.4 355 
Apr 15.0 13.7 1015.4 1013.8 73 97 182 0 0.3 322 0.3 328 
May 22.6 19.2 1015.9 1015.8 7 72 239 20 7 156 0.6 187 
Jun 26.8 23.8 1013.9 1015.3 59 86 136 27 0.6 92 1.0 198 
Jul 29.4 26.4 1012.9 1016.0 150 99 275 19 2.4 217 1.8 210 
Aug 26.1 25.9 1014.8 1016.0 114 98 221 30 0.6 159 0.5 97 
Sep 25.7 22.8 1017.6 1017.6 7 77 226 5 2.1 63 2.0 40 
Oct 21.5 18.2 1016.8 1019.1 124 70 143 17 2.6 15 2.3 26 
Nov 16.8 13.6 1018.4 1018.3 46 87 145 26 1.7 321 1.7 344 
Dec 9.8 8.1 1019.2 1019.5 97 66 131 4 2.4 294 2.1 328 
Average 18.3 16.2 1015.7 1016.9 84 85 7 318 0.8 351 
Total 1013. 1025 
Air Temperature 
11. The FRF enjoys a typical marine climate that moderates the temper- 
ature extremes of both summer and winter. 
Measurement instruments 
12. A Yellow Springs Instrument Company, Inc. (YSI) (Yellow Springs, 
OH) electronic temperature probe with analog output interfaced to the FRF’s 
computer was operated beside the NWS’s meteorological instrument shelter 
located 43 m behind the dune (Figure 2). To ensure proper temperature 
9 
