Table 3 

 Air Temperature Statistics, ° C 





















Mean 



HiKh 



Maxima 

 1980-1983 





Mean Low 



Minima 



Month 



1983 



1980-1982 



1983 



1980-1982 



1980-1983 



Jan 

 Feb 

 Mar 



9.3 



9.7 



15.0 



7.8 



8.2 



12.5 



20 

 22 

 24 





3.4 

 2.5 

 5.8 



-0.3 

 0.9 



4.1 



-14 

 -11 

 -7(83) 



Apr 

 May 

 Jun 



17.7 

 22.8 

 26.4 



19.4 

 23.6 

 27.8 



30 

 35 

 35 





8.0 

 14.8 

 18.5 



10,4 

 14.5 

 19.5 



-2 

 6 



11 



Jul 

 Aug 

 Sep 



31.3 

 30.9 

 27.8 



30.0 

 29.0 

 27.0 



43 

 37 

 34 





24.6 

 21.9 

 20.5 



21.9 

 21.1 

 19.5 



13 



15(83) 



10 



Oct 

 Nov 

 Dec 



22.9 

 18.7 

 14.7 



20.7 

 16.3 

 12.5 



30(83) 

 32(83) 

 25 



15.6 

 8.3 

 3.9 



12.8 

 8.1 

 3.7 



4 

 -3 



-14(83) 



Annual 



20.6 



19.4 







12.3 



11.3 





temperatures can be expected at the FRF from December through February. 



58. Since measurements every 6 hr were not made in years prior to 1983, 

 only the daily high and low values (Table 3) can be compared. This shows that 

 throughout the year the high and low temperatures during 1983 were higher than 

 mean values for 1980 through 1982. 



Atmospheric pressure 



59. The atmospheric pressure variation showed a tendency for low pres- 

 sures to develop during March and April and for high pressures to develop from 

 September through December (Figure 5). Data are not available from FRF for 

 prior years for comparison. 



Precipitation 



60. During 1983, precipitation was generally high in the spring and 

 fall and low in the summer (Figure 6). A total of 1,248 mm was received dur- 

 ing the year for a monthly mean of 104 mm. 



61. In prior years, the monthly mean was 86 mm (20 percent less than 

 during 1983) and more evenly distributed throughout the year. Monthly maxima 

 for all the years of measurements occurred in March, April, October, and De- 

 cember while minima occurred in July 1983 (Table 4). 



30 



