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Fresnillo de las Dueñas · Ribera del Duero
degrees between night and day
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- high
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- low
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- now
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- humidity
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- wind
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- rain today
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- sunrise
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- sunset
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- daylight
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- hours of sun
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- radiation
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- uv index
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- dew point
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- gusts
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- wind from
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- pressure
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When the dew point closes in on the low, the vine wakes up wet — and that is how mildew gets in.
- surface
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- at 6 cm
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- at 54 cm
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- water, 3–9 cm
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- water, 27–81 cm
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The root goes down looking for what the surface will not give it. These are the depths it works in. See the subsoil →
- rain today
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- lost to the air today
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- season balance
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- days without rain
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The balance is what has rained since 1 April minus what the soil and the leaves have given back to the air. It is almost always in the red here, and that is the whole argument for dry farming.
Growing degree days accumulated since 1 April, against the average of the last five years.
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— °C·d
since 1 April, base 10 °C
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- nights below 12 °C
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- days above 35 °C
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- average swing
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- hottest day
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Cool nights are what keep the acidity. Days above 35 °C stop the ripening outright: the vine shuts its pores and waits.
Each bar is the swing between that day’s high and low.
- One point, nineteen lieux-dits.
- Everything above is modelled over a single point: Carpio, in Fuentespina — the vineyard that gives the red its name. The estate is nineteen lieux-dits spread over three villages, some five kilometres from one end to the other. The temperature, the swing, the rain, the sun and the moon are shared across that distance. The soil water and the soil temperature are not: they depend on how much earth there is before the rock and what that earth is made of, and this changes from one plot to the next — sometimes across a single track. Carpio has 118 cm before the settled Miocene clays; other plots strike limestone at sixty. So read the soil figures as what the ground is doing at Carpio, and not as an average of nineteen different soils.
- The swing
- The difference between the high and the low of the same day. It is the argument of this land: at nine hundred metres the night takes back what the day gave, the grape stops spending sugar after dark and keeps the acidity that holds a wine upright. Fifteen degrees is a good day here.
- Growing degree days
- The vine does nothing below ten degrees. So instead of counting days you count degrees: each day adds whatever its mean temperature has above ten, and you sum them from 1 April. The running total is a better clock than the calendar — it is what says whether the harvest falls on the 23rd or on the 30th, which is why it is compared against the five previous years and not against a target.
- The water balance
- What has rained since 1 April, minus what the soil and the leaves have given back to the air. It is almost always in the red here, and that is the whole argument for dry farming: a vine that cannot drink from above sends its roots down. One honest caveat — the evapotranspiration series only reaches ninety-two days back, so the earlier stretch is estimated from the daily average of what is measured. April and May evaporate less than July, so the figure errs on the cautious side.
- Measured, or worked out
- The weather is measured: open-meteo, an open model, refreshed every hour. The moon is not — its phase is worked out on this page from the synodic cycle of 29.530588853 days, counted from the new moon of 6 January 2000. The stage of the cycle, the degree days and the balance are also worked out here, from the figures above. Nothing on this report is decoration.