**3. Results**

The annual average of the diurnal precipitation cycles for the three types of groups is shown in Figure 2. Hourly rates are less than 0.35 mm/h when set up for 4 or 5 groups. However, with 6 groups, a maximum of 0.42 mm/h was observed in the new cluster, group 6 in the 1900 UTC range, located in the coastal and inland region of the Amazon.

In the configuration of four clusters, it is made by three dominant types of variability. The first, with the presence of group 1 and 2, has a maximum at 1900 UTC and is typical of continental regimes and associated with a strong convective activity in the middle and late afternoon. Group 1 is more observed in the South and also in the Southeast and

Midwest. Group 2 is geographically located in the Midwest region of the country; the highest rainfall intensity is more pronounced in the South, in relation to the next variability group, group 3, which comprises the northeastern coastal region, with a maximum of 0.30 mm/h at 09:00 UTC.

**Figure 2.** Annual Average of the daytime precipitation cycles for 4, 5, and 6 clusters in the Brazilian territory.

Another mode is group 4 characterized by maximums at 07:00 UTC and 19:00 UTC. And the Amazon, with a mixture of diurnal cycles, in addition to the rain in the middle of the afternoon (more common in group 1) also has precipitation during the night and early morning.
