Cumulus Frequency of Occurrence (%) July (1954 - 1997) Night, Ship Observations Only Global Average: 31.5 Zonal Averages 15 zones Lat.N Average 85 1.4 75 3.8 65 7.6 55 7.0 45 9.3 35 29.2 25 45.3 15 41.5 5 40.7 -5 48.4 -15 41.5 -25 36.3 -35 28.3 -45 20.0 -55 11.3 Grid Box Averages 321 filled boxes Box # Lat.N Lon.E Average 1 85 60 2.0 2 85 180 0.7 3 85 300 1.7 4 75 20 7.1 5 75 60 4.7 6 75 100 3.1 7 75 140 0.5 8 75 180 2.2 9 75 220 4.0 10 75 260 7.0 11 75 300 3.1 12 75 340 2.8 13 65 10 11.1 14 65 30 11.8 15 65 50 9.3 16 65 70 8.4 20 65 150 11.9 21 65 170 5.9 22 65 190 4.8 23 65 210 8.7 25 65 250 16.5 26 65 270 6.9 27 65 290 6.5 28 65 310 3.3 29 65 330 8.0 30 65 350 8.8 31 55 10 16.1 32 55 30 18.5 37 55 130 16.2 38 55 150 5.9 39 55 170 3.9 40 55 190 3.7 41 55 210 6.6 42 55 230 10.1 44 55 270 6.6 45 55 290 7.8 46 55 310 5.4 47 55 330 6.7 48 55 350 11.0 49 45 5 16.6 50 45 15 15.2 51 45 25 16.4 52 45 35 17.8 62 45 135 8.5 63 45 145 5.7 64 45 155 3.4 65 45 165 1.5 66 45 175 1.5 67 45 185 2.1 68 45 195 3.0 69 45 205 4.6 70 45 215 5.4 71 45 225 8.3 72 45 235 13.0 77 45 285 12.9 78 45 295 11.5 79 45 305 13.4 80 45 315 12.3 81 45 325 17.4 82 45 335 16.8 83 45 345 18.3 84 45 355 21.1 85 35 5 20.4 86 35 15 14.2 87 35 25 11.9 88 35 35 24.2 96 35 115 9.8 97 35 125 23.1 98 35 135 34.4 99 35 145 23.2 100 35 155 18.7 101 35 165 23.8 102 35 175 30.6 103 35 185 30.1 104 35 195 31.7 105 35 205 27.5 106 35 215 20.2 107 35 225 14.5 108 35 235 10.5 109 35 245 8.3 112 35 275 37.8 113 35 285 36.0 114 35 295 42.5 115 35 305 48.6 116 35 315 57.8 117 35 325 48.0 118 35 335 33.4 119 35 345 27.9 120 35 355 17.8 124 25 35 3.1 125 25 45 3.9 126 25 55 9.1 127 25 65 19.7 129 25 85 23.5 131 25 105 40.7 132 25 115 45.1 133 25 125 52.4 134 25 135 51.6 135 25 145 51.0 136 25 155 52.0 137 25 165 53.2 138 25 175 56.0 139 25 185 58.1 140 25 195 60.5 141 25 205 50.7 142 25 215 29.1 143 25 225 14.7 144 25 235 11.3 145 25 245 21.2 146 25 255 35.0 147 25 265 54.9 148 25 275 54.8 149 25 285 52.4 150 25 295 61.1 151 25 305 67.8 152 25 315 64.6 153 25 325 49.8 154 25 335 34.8 155 25 345 17.7 160 15 35 7.4 161 15 45 8.3 162 15 55 17.6 163 15 65 38.6 164 15 75 22.7 165 15 85 31.0 166 15 95 30.2 167 15 105 32.9 168 15 115 44.8 169 15 125 42.0 170 15 135 38.5 171 15 145 44.6 172 15 155 47.9 173 15 165 56.5 174 15 175 57.0 175 15 185 60.4 176 15 195 58.1 177 15 205 52.9 178 15 215 37.7 179 15 225 25.7 180 15 235 23.8 181 15 245 37.3 182 15 255 35.4 183 15 265 33.0 184 15 275 41.6 185 15 285 47.9 186 15 295 54.4 187 15 305 57.3 188 15 315 50.0 189 15 325 38.1 190 15 335 30.6 191 15 345 26.6 193 5 5 26.9 197 5 45 49.8 198 5 55 46.3 199 5 65 58.6 200 5 75 41.8 201 5 85 44.0 202 5 95 40.0 203 5 105 43.1 204 5 115 41.9 205 5 125 40.7 206 5 135 40.1 207 5 145 40.4 208 5 155 41.1 209 5 165 37.2 210 5 175 38.8 211 5 185 46.3 212 5 195 47.8 213 5 205 48.0 214 5 215 44.0 215 5 225 46.0 216 5 235 35.3 217 5 245 29.2 218 5 255 26.3 219 5 265 20.9 220 5 275 24.5 221 5 285 27.9 223 5 305 46.0 224 5 315 48.0 225 5 325 57.5 226 5 335 46.2 227 5 345 33.8 228 5 355 31.1 229 -5 5 27.2 230 -5 15 18.1 233 -5 45 55.3 234 -5 55 52.4 235 -5 65 46.5 236 -5 75 44.9 237 -5 85 43.2 238 -5 95 42.5 239 -5 105 53.2 240 -5 115 53.6 241 -5 125 46.8 242 -5 135 48.5 243 -5 145 41.9 244 -5 155 35.0 245 -5 165 41.8 246 -5 175 58.6 247 -5 185 57.1 248 -5 195 62.6 249 -5 205 72.3 250 -5 215 67.3 251 -5 225 62.9 252 -5 235 71.8 253 -5 245 60.1 254 -5 255 36.7 255 -5 265 18.8 256 -5 275 10.7 260 -5 315 50.7 261 -5 325 52.7 262 -5 335 56.7 263 -5 345 50.4 264 -5 355 35.4 265 -15 5 13.7 266 -15 15 10.3 268 -15 35 58.0 269 -15 45 51.9 270 -15 55 49.4 271 -15 65 47.5 272 -15 75 47.7 273 -15 85 36.3 274 -15 95 35.2 275 -15 105 52.9 276 -15 115 40.7 277 -15 125 26.0 278 -15 135 43.8 279 -15 145 42.1 280 -15 155 42.9 281 -15 165 43.2 282 -15 175 37.7 283 -15 185 40.4 284 -15 195 55.4 285 -15 205 54.4 286 -15 215 58.2 287 -15 225 63.7 288 -15 235 55.6 289 -15 245 53.3 290 -15 255 39.8 291 -15 265 19.3 292 -15 275 10.6 293 -15 285 7.8 297 -15 325 53.6 298 -15 335 53.7 299 -15 345 41.9 300 -15 355 19.1 301 -25 5 20.9 302 -25 15 20.0 304 -25 35 47.7 305 -25 45 47.1 306 -25 55 48.7 307 -25 65 37.5 308 -25 75 34.1 309 -25 85 27.6 310 -25 95 29.1 311 -25 105 40.2 312 -25 115 27.7 316 -25 155 43.8 317 -25 165 44.4 318 -25 175 41.0 319 -25 185 35.8 320 -25 195 32.7 321 -25 205 38.7 322 -25 215 37.3 323 -25 225 43.0 324 -25 235 38.0 325 -25 245 50.0 328 -25 275 25.2 329 -25 285 20.5 332 -25 315 28.8 333 -25 325 41.6 334 -25 335 36.0 335 -25 345 39.7 336 -25 355 29.8 337 -35 5 21.2 338 -35 15 23.0 339 -35 25 23.8 340 -35 35 38.4 341 -35 45 36.6 342 -35 55 31.9 343 -35 65 25.8 344 -35 75 21.4 345 -35 85 20.9 346 -35 95 23.6 347 -35 105 29.6 348 -35 115 31.0 349 -35 125 27.1 350 -35 135 29.4 351 -35 145 27.0 352 -35 155 34.8 353 -35 165 36.6 354 -35 175 35.8 355 -35 185 31.5 356 -35 195 32.4 357 -35 205 34.8 358 -35 215 33.1 359 -35 225 35.1 364 -35 275 25.9 365 -35 285 22.0 367 -35 305 14.6 368 -35 315 26.9 369 -35 325 22.1 370 -35 335 24.9 371 -35 345 26.5 372 -35 355 20.6 387 -45 145 18.6 388 -45 155 24.3 389 -45 165 23.4 390 -45 175 19.2 391 -45 185 13.9 393 -45 205 21.6 397 -45 245 20.3 400 -45 275 22.2 401 -45 285 22.5 402 -45 295 10.7 403 -45 305 15.4 404 -45 315 25.1 417 -55 170 3.3 423 -55 290 14.9 424 -55 310 17.7 425 -55 330 10.0