Berkeley in January: A Foot (or More) of Rain

I can hear the rain pounding down right now, just as it has been for much of the last few days and for most of January.

Our modest electronic rain gauge shows we’ve had 4 inches of rain in the last five days and 9.5 inches since Jan. 7; that’s 9.5 inches in half a month. I am a lousy record keeper, but I know we’d had about an inch and a half or 2 inches this month before Jan. 7. So we are looking at 11 to 12 inches of rain so far this month. Which I call a lot.

The current month’s record’s from Berkeley’s “official” weather station on the Cal campus aren’t available (the most recent available through the National Climate Data Center are from November; I’ve failed over the years to figure out how to get more current numbers from the folks who monitor the station).

But to double-check my half-informed guesstimate, I asked my friend Pat, whose boyfriend Paul is a weather geek with his own home weather station, how much rain they’ve seen at their place up in the Berkeley Hills. The caveat is that their place is at an elevation of 900 feet or so and is likely to get more rain than we do here at 120 feet above sea level in the Berkeley flats.

Nonetheless, here’s Pat’s Sunday afternoon report: 13.05 inches total rainfall since Jan. 1 and 4.59 inches over the past five days.

And one other cross-check, this time from a spot that I know is significantly wetter: Tilden Park’s Vollmer Peak, at 1,905 feet the highest point in the Berkeley Hills. The state Department of Water Resources reports readings from a gauge on the peak. It shows 16.5 inches for the month so far and 4.9 over the past five days.

I’ll declare it confirmed: What people have been seeing all over Northern California and the Bay Area is true in Berkeley, as well — we’ve had a very wet January. Although … not the rainiest we’ve ever seen in these parts.

Berkeley’s official weather record goes back to 1893. According to the precipitation data maintained by the Western Regional Climate Center, Berkeley’s rainiest January occurred in 1916, when 16.54 inches were recorded at the campus station.

Because the record for that month is incomplete — five days are missing — the January 1916 record is not officially considered our rainiest January. Instead, almost-as-soggy January 1911, when 15.99 inches fell, is listed as our January maximum. Huh — one could question the logic in that.

Either of those months — January 1911 or January 1916 — would qualify as Berkeley’s rainiest month on record.

Assuming I’m correct and we’re in the 11- to 12-inch mark for January rain, this would mark Berkeley’s 14th January with 10 inches of more or rain. And it would be the rainiest since 1973, when 12.47 inches fell.

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