boxplot will do.
x = [Jan Feb ... ] ; % assume Jan, Feb are column vectors that contain the data with the same length.
figure;boxplot(x); % will plot something similar to what you want.
Noted that there are many options you can play with, e.g. 'boxstyle', 'color','width', 'whisker'.
The edges of the box are 25th and 75th percentiles. There is no direct way to modify this.
