ARSO VREME
meteo.si > Overview > Climate > Current > Last 12 months > Description of diagrams

Description of diagrams

Mean monthly air temperature anomaly

Mean daily air temperature is calculated as the sum of one quarter of the measured values at 7.00 local mean time (LMT) and 14.00 LMT and half of the value at 21.00 LMT. The figure presents the monthly mean of daily values.

Air temperature is measured in standard meteorological screen (Stevenson screen) 2 metres above the ground.

The chart represents the time series of temperature conditions in the previous 12 months. Example: today is 6 July 2009, thus the temperature time series from July 2008 through June 2009 is presented on the chart.

In the upper right-hand corner of the chart two temperature means are given. The first refers to the previous 12 months and the second to the climate normal (1991–2010) of the 12-month time window. Days with missing data are excluded from the calculation of the means.

The greyish zone represents the span of monthly temperature mean in the reference period (1991–2010) on the given month. Half of the monthly means in that period lies in the zone. A quarter of the highest values of the period lies above and a quarter of the lowest values below the zone.

Missing values of the temperature anomaly in last 12 months are not shown (the line is broken).

Back to Current climate - last 12 months



Monthly mean of mean, maximum and minimum daily air temperature

Mean daily air temperature is calculated as the sum of one quarter of the measured values at 7.00 local mean time (LMT) and 14.00 LMT and half of the value at 21.00 LMT. The maximum and minimum air temperature are the extreme values in the 24-hour period preceding the 21.00 LMT. The figure presents the monthly means of daily values.

Mean monthly temperature usually lies approximately in the middle between the monthly means of the two extreme temperatures.

Air temperature is measured in standard meteorological screen (Stevenson screen) 2 metres above the ground.

The chart represents the time series of temperature conditions in the previous 12 months. Example: today is 24 May 2009, thus the temperature time series from May 2008 through April 2009 is presented on the chart.

Missing values are not shown (the line is broken).

Back to Current climate - last 12 months



Monthly precipitation sum

The figure represents the time series of monthly precipitation sum in the previous 12 months. Daily precipitation sum is measured at 7.00 CET. The measured value is attributed to the date of measurement. Monthly sum is the sum of daily values.

Precipitation sum is measured using Hellmann rain gauge (pluviometer) with the aperture of 200 cm2.

The chart represents the time series of precipitation conditions in the previous 30 days (or 30 days preceding the previous day, depending on the hour). Example: today is 15 August 2009, thus the precipitation time series from August  2008 through July 2009 is presented on the chart.

The greyish zone represents the span of normal monthly precipitation sum in the reference period (1991–2010) on the given month. Half of the monthly sums from that period lies in the zone. A quarter of the highest values lies above and a quarter of the lowest values below the zone.

In the upper right-hand corner of the chart two precipitation sums are given. The first refers to the previous 12 months and the second to the climate normal (1991–2010) of the 12-month time window. Months with missing data are excluded from the calculation of the sums.

Missing values are marked by rose column.

Back to Current climate - last 12 months



Monthly mean snow depth

The figure represents the time series of mean monthly total snow depth. Total snow depth is measured on grass each day at 7.00 CET. The observer notes down snow cover when it covers at least half of the ground at meteorological station. Monthly value is the average of daily values.

The chart represents the time series of total snow depth in the previous 12 months. Example: today is 11 January 2010, thus the precipitation time series from January 2009 through December 2009 is presented on the chart.

The greyish zone represents the span of normal monthly total snow depth in the reference period (1991–2010) on the given month. Half of the monthly means from that period lies in the zone. A quarter of the highest values lies above and a quarter of the lowest values below the zone.

Missing values are marked by rose column.

Back to Current climate - last 12 months



Monthly bright sunshine duration

The figure represents the time series of monthly bright sunshine duration for the previous 12 months. Monthly sunshine duration is the sum of the daily values.

Bright sunshine duration is measured using the Campbell-Stokes recorder. In sunny weather the glass sphere lens burns the card behind it. Daily sunshine duration is proportional to the length of burned trace on the card.

The chart represents the time series of sunshine duration in the previous 30 days (or 30 days preceding the previous day, depending on the hour). Example: today is 30 August 2009, thus the sunshine duration time series from August 2008 through July 2009 is presented on the chart.

The greyish zone represents the span of normal monthly sunshine duration in the reference period (1991–2010) on the given month. Half of the monthly sums from that period lies in the zone. A quarter of the highest values lies above and a quarter of the lowest values below the zone.

In the upper right-hand corner of the chart two sunshine duration sums are given. The first refers to the previous 12 months and the second to the climate normal (1991–2010) of the 12-month time window. Months with missing data are excluded from the calculation of the sums.

Sunshine duration is shorter in hilly terrain and at meteorological stations with obstacles preventing undisturbed sunshine.

Missing values are marked by rose column.

Back to Current climate - last 12 months

Ministry of the environment and spatial planning
SLOVENIAN ENVIRONMENTAL AGENCY
Vojkova 1b, SI-1000 Ljubljana, Slovenia Tel: +386 1 4784 000 Fax: +386 1 4784 052