[psherman]

You can switch to the metric system on their website [1]. The graph can also be switched to metric by changing the "uom" query parameter from "E" to "M"

[1] http://www.ndbc.noaa.gov/station_page.php?station=42058&unit...

[thomasahle]

Here is the plot on m/s and mbar: http://www.ndbc.noaa.gov/show_plot.php?station=42058&meas=wd...

[nayuki]

It would be better if NOAA used kilopascal (an actual SI unit) instead of millibar, but I guess the conversion is not too bad since 1000 mbar = 100 kPa.

[StavrosK]

"Oh wow, air pressure fell to almost zero, a person would suffocate in ther... Wait a minute, the ground unit is 940! This is a 6% difference!"