182 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1958 
RAINFALL 
During the dry season (January through April) of the calendar 
year 1957, rains of 0.01 inch or more fell during 20 days (83 hours) 
and amounted to 1.20 inches, as compared to 12.53 inches during 1956. 
During the wet season of 1957 (May through December), rains of 
0.01 inch or more fell on 176 days (647 hours) and amounted to 96.77 
inches, as compared to 101.42 inches during 1956. Total rainfall for 
TABLE 1.—Annual rainfall, Barro Colorado Island, C. Z. 
Year Total Station Year Total Station 
inches average inches average 
NO2b iS see SO Fs B53 7 fon ane ae ee 194720 ease 111. 10 108. 55 
1OZ6e 22 ee eee 118. 22 lSs56) ||P 9452 eeeeee= 120. 29 109. 20 
US Ay fees Se 116. 36 WAG Se ||) GS4. eee 111. 96 109. 30 
WO2S55 Secon 101. 52 Va WAS AS) Meee) is) 120. 42 109. 84 
O20 8 = soa 87. 84 OG: 565 194022245223 87. 38 108. 81 
1OZO SE Ss aee ee (6S 57 OMe Shs | al 4: (poser a eee 77. 92 107. 49 
LOS sae soe 123. 30 104169" |} 194822222 222 83. 16 106. 43 
MOS Zits Bee aa LS 02 NOS a765l| 1949 bee ee 114, 86 106. 76 
lQ33ee =e a 161. 73 O57 32a|| 195022222 ee 114. 51 107. 07 
OSA we UU ke 122. 42 LOPOL8 || UO Slee ee 112. 72 107. 28 
NOS b seen ee ae 143. 42 ORS a 9522 eae eee = 97. 68 106. 94 
NWO3G8= 222i % 93. 88 LOSVOS | 1O53s2 see oe 104. 97 106. 87 
NOS Tue Le 124.13 LOSS: || 9 54a 105. 68 106. 82 
LOSS eeeee 117. 09 110. 62 | UG ates aes ee 114, 42 107. 09 
1959S ssaae= 115. 47 LON94 ||) 195652 22-252— 114. 05 107. 30 
MOA QBs Seo 86. 51 1O9N43 7 Loo vs2s eeeee 97. 97 106. 98 
TOA eA Gee teen 91. 82 108. 41 
TABLE 2.—Comparison of 1956 and 1957 rainfall, Barro Colorado Island (inches) 
Total Years 1957 Aeccumu- 
Month __| Station of excess OF lated 
average | record | deficiency | excess or 
1956 1957 deficiency 
DONUT YES eS ae Pas ES §. 57 0.55 2.14 Se —1.58 —1. 58 
Webrbary acess cee a et RS 2.11 0. 67 1.22 82 —0. 65 —2. 23 
Mi On Ces ced sae oe ea ee eee 2.2, 0.02 1.15 82 —1.18 —3. 36 
SADIE oe ae oe Oe es he Se ee 2.61 0.05 2.94 83 —2.89 —6.25 
Mia yio 7 2 o5k ibs ea ee RA ee A 16. 55 6. 37 10. 87 33 —4. 50 —10. 75 
JUNC Se Fase ee ae ree eee 6. 85 5.97 10. 95 33 —4. 98 —15. 73 
UU Laser se er re en ne aw oa 19.55 | 10.86 11.78 33 —0. 92 —16. 65 
JA etis tes eS oa SD EEO, Pe ee Sone tes SIE 9.48 | 21.90 12. 48 33 +9. 42 7. 23 
Septem her-22222-- 222-4 ee ee 11.27 | 12.40 10. 04 33 +2. 36 —4, 87 
LOX G0) 013) eens ee eee ee es 18.64 | 17.22 14. 00 33 +3. 22 —1.65 
INovember 22222222 se eee eee es 12.37 | 17.96 18. 79 33 —0. 83 —2. 48 
IDYeYols\ nel o}:) Pee eee ees Se ee ee 6. 81 4.09 10. 62 33 —6. 53 —9. 01 
Viear ss tau cet tee Boe ee eae 114.05 | 97.97 10608) |'f.--2 4S) <2 ce ee —9. 01 
ID TY{SCOSON as ccc aaa ok aoe ae 12.53 1.20 Tb east oboe Seccceeeses —6. 25 
Wret (season: 2220-2. 2 =~ 522 ets Ea 101.52 | 96.77 OO.bSh isi eA Ae Ee es —2. 76 
