Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thirteen years of Weather Statistics at San Pedro Martir Observatory   We present weather statistics for thirteen years of data gathered with the
meteorological stations at Observatorio Astron\'omico Nacional in the Sierra
San Pedro M\'artir (OAN-SPM) over the period 2007-2019. These weather stations
include sensors that measure temperature, atmospheric pressure, relative
humidity, precipitation and wind conditions, among other climatological
variables. The median values of the air temperature are $10.3^{\circ}$ C and
$7.0^{\circ}$ C for daytime and nighttime, respectively. The relative humidity
follows a seasonal variation with April-June being the driest months while
July-September being the most humid. The median values for the sustained wind
speed are 11 and 14 km hr$^{-1}$ for daytime and nighttime data, respectively.
Preferred wind directions are SSW and North. Sustained winds are stronger at
night and during December, January and February. Our data indicate an annual
mean rain precipitation of 313 mm, most of which occurs during the summer
season as afternoon thunderstorms.

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The categories of this paper are: bayes-an
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci