Cumulus Frequency of Occurrence (%) June (1954 - 1997) Night, Ship Observations Only Global Average: 32.1 Zonal Averages 15 zones Lat.N Average 85 1.3 75 4.0 65 9.6 55 8.2 45 9.7 35 22.5 25 43.4 15 43.7 5 41.5 -5 51.2 -15 44.1 -25 38.7 -35 27.8 -45 19.3 -55 13.2 Grid Box Averages 326 filled boxes Box # Lat.N Lon.E Average 1 85 60 3.2 2 85 180 0.4 3 85 300 0.0 4 75 20 9.7 5 75 60 4.5 6 75 100 4.9 7 75 140 3.0 8 75 180 0.6 9 75 220 0.7 10 75 260 5.5 11 75 300 6.3 12 75 340 3.8 13 65 10 11.9 14 65 30 12.0 15 65 50 11.2 20 65 150 7.3 21 65 170 6.3 22 65 190 5.1 23 65 210 10.0 27 65 290 12.7 28 65 310 4.9 29 65 330 9.6 30 65 350 11.9 31 55 10 14.1 32 55 30 11.6 37 55 130 8.9 38 55 150 6.8 39 55 170 4.1 40 55 190 5.1 41 55 210 8.6 42 55 230 12.4 45 55 290 14.9 46 55 310 7.1 47 55 330 9.1 48 55 350 11.9 49 45 5 17.8 50 45 15 16.6 51 45 25 14.6 52 45 35 17.6 53 45 45 6.6 54 45 55 12.2 62 45 135 8.2 63 45 145 6.0 64 45 155 3.5 65 45 165 2.0 66 45 175 2.8 67 45 185 3.5 68 45 195 6.1 69 45 205 6.5 70 45 215 7.5 71 45 225 11.3 72 45 235 15.5 77 45 285 10.3 78 45 295 10.3 79 45 305 10.9 80 45 315 10.4 81 45 325 16.1 82 45 335 15.7 83 45 345 17.9 84 45 355 20.5 85 35 5 20.6 86 35 15 15.2 87 35 25 14.5 88 35 35 22.4 96 35 115 9.9 97 35 125 15.2 98 35 135 19.1 99 35 145 15.4 100 35 155 12.7 101 35 165 13.2 102 35 175 16.0 103 35 185 16.2 104 35 195 18.6 105 35 205 19.2 106 35 215 16.9 107 35 225 17.8 108 35 235 15.2 109 35 245 10.4 112 35 275 40.0 113 35 285 31.7 114 35 295 36.0 115 35 305 37.5 116 35 315 44.0 117 35 325 37.5 118 35 335 28.0 119 35 345 27.4 120 35 355 21.0 124 25 35 3.9 125 25 45 11.1 126 25 55 8.3 127 25 65 36.8 128 25 75 44.6 129 25 85 24.0 131 25 105 24.6 132 25 115 37.1 133 25 125 34.6 134 25 135 38.9 135 25 145 49.6 136 25 155 47.0 137 25 165 50.1 138 25 175 52.7 139 25 185 57.9 140 25 195 61.1 141 25 205 52.4 142 25 215 31.7 143 25 225 15.4 144 25 235 12.5 145 25 245 16.5 146 25 255 27.9 147 25 265 56.7 148 25 275 52.4 149 25 285 45.0 150 25 295 53.7 151 25 305 62.8 152 25 315 61.2 153 25 325 56.8 154 25 335 39.5 155 25 345 22.5 160 15 35 7.7 161 15 45 12.4 162 15 55 27.8 163 15 65 48.3 164 15 75 29.0 165 15 85 30.9 166 15 95 32.6 167 15 105 32.6 168 15 115 43.1 169 15 125 44.8 170 15 135 47.6 171 15 145 54.3 172 15 155 57.1 173 15 165 65.9 174 15 175 54.6 175 15 185 57.1 176 15 195 58.6 177 15 205 56.1 178 15 215 38.9 179 15 225 28.5 180 15 235 24.4 181 15 245 31.8 182 15 255 37.8 183 15 265 34.0 184 15 275 41.7 185 15 285 46.5 186 15 295 56.1 187 15 305 57.0 188 15 315 50.1 189 15 325 35.2 190 15 335 35.6 191 15 345 16.7 193 5 5 31.5 197 5 45 54.5 198 5 55 52.6 199 5 65 54.5 200 5 75 40.5 201 5 85 45.0 202 5 95 42.1 203 5 105 42.4 204 5 115 38.4 205 5 125 37.1 206 5 135 36.9 207 5 145 36.1 208 5 155 39.6 209 5 165 45.0 210 5 175 42.1 211 5 185 47.1 212 5 195 49.7 213 5 205 51.1 214 5 215 47.3 215 5 225 42.7 216 5 235 39.0 217 5 245 38.4 218 5 255 35.4 219 5 265 29.4 220 5 275 25.0 221 5 285 26.4 223 5 305 36.5 224 5 315 43.3 225 5 325 50.2 226 5 335 42.6 227 5 345 34.1 228 5 355 31.9 229 -5 5 34.0 230 -5 15 15.9 233 -5 45 59.5 234 -5 55 54.3 235 -5 65 53.3 236 -5 75 49.8 237 -5 85 47.7 238 -5 95 46.9 239 -5 105 47.9 240 -5 115 53.6 241 -5 125 44.6 242 -5 135 45.5 243 -5 145 40.4 244 -5 155 39.3 245 -5 165 50.0 246 -5 175 45.4 247 -5 185 56.6 248 -5 195 61.8 249 -5 205 67.8 250 -5 215 67.7 251 -5 225 66.2 252 -5 235 73.4 253 -5 245 64.2 254 -5 255 49.1 255 -5 265 29.4 256 -5 275 15.4 257 -5 285 11.7 260 -5 315 52.7 261 -5 325 53.0 262 -5 335 58.6 263 -5 345 58.8 264 -5 355 44.8 265 -15 5 20.9 266 -15 15 13.7 268 -15 35 57.2 269 -15 45 52.7 270 -15 55 48.5 271 -15 65 49.9 272 -15 75 42.6 273 -15 85 42.7 274 -15 95 37.4 275 -15 105 49.6 276 -15 115 40.5 277 -15 125 30.0 278 -15 135 48.1 279 -15 145 41.2 280 -15 155 44.1 281 -15 165 39.6 282 -15 175 44.6 283 -15 185 46.6 284 -15 195 56.0 285 -15 205 54.9 286 -15 215 58.3 287 -15 225 63.7 288 -15 235 58.0 289 -15 245 59.1 290 -15 255 46.2 291 -15 265 33.2 292 -15 275 12.3 293 -15 285 9.7 297 -15 325 53.3 298 -15 335 56.4 299 -15 345 44.2 300 -15 355 29.6 301 -25 5 23.4 302 -25 15 22.2 304 -25 35 44.5 305 -25 45 47.5 306 -25 55 49.9 307 -25 65 40.0 308 -25 75 37.2 309 -25 85 34.9 310 -25 95 31.8 311 -25 105 40.3 312 -25 115 34.7 316 -25 155 42.2 317 -25 165 41.4 318 -25 175 33.8 319 -25 185 35.6 320 -25 195 44.1 321 -25 205 39.0 322 -25 215 37.3 323 -25 225 43.0 324 -25 235 48.4 325 -25 245 52.9 326 -25 255 49.5 327 -25 265 30.0 328 -25 275 28.5 329 -25 285 22.1 332 -25 315 32.7 333 -25 325 48.8 334 -25 335 42.9 335 -25 345 38.9 336 -25 355 35.3 337 -35 5 23.1 338 -35 15 26.1 339 -35 25 22.6 340 -35 35 36.2 341 -35 45 37.3 342 -35 55 30.0 343 -35 65 26.5 344 -35 75 23.1 345 -35 85 20.5 346 -35 95 23.0 347 -35 105 32.6 348 -35 115 32.9 349 -35 125 29.6 350 -35 135 28.0 351 -35 145 25.2 352 -35 155 34.2 353 -35 165 32.6 354 -35 175 29.2 355 -35 185 33.9 356 -35 195 25.5 357 -35 205 30.1 358 -35 215 29.0 359 -35 225 30.3 360 -35 235 24.1 364 -35 275 26.5 365 -35 285 20.9 367 -35 305 16.8 368 -35 315 25.4 369 -35 325 30.4 370 -35 335 32.1 371 -35 345 21.4 372 -35 355 23.0 387 -45 145 26.0 388 -45 155 24.7 389 -45 165 18.2 390 -45 175 19.5 391 -45 185 13.9 392 -45 195 19.8 394 -45 215 12.8 397 -45 245 17.4 398 -45 255 15.4 400 -45 275 23.6 401 -45 285 17.5 402 -45 295 14.4 403 -45 305 20.8 404 -45 315 23.5 417 -55 170 9.1 423 -55 290 12.2 424 -55 310 13.1 425 -55 330 18.2