Analysisof Weather Data
SanDiego is a City situated in the state of Southern California. Theaverage annual data for precipitation, the minimum temperature, andthe maximum temperature is imported from NOAA’S National Centersfor Environment Information. NOAA assesses, monitors, preserves andallows the public to access the Nation’s climatic trends,historical weather information and data since 1885 to present.However, I extracted the data starting from the year 1965 to the year2105. The values for each year are the averages of the 12 months forrespective precipitation or temperatures. The units for theprecipitation are in inches while for temperatures are in DegreesFahrenheit (ºF). The average for the precipitation and high and lowtemperatures for the 50 years is then calculated and recorded at thebottom of the respective columns. The difference between each entryand respective averages for the 50 years is calculated and recordedin excel. The three deviation variables for the 50 years are used toplot the graphs which need to be analyzed and interpreted.
Agraph representing deviation from 50 years average annualprecipitationagainst years
Interpretationof the Graphs
Thehorizontal values numbered 1 up to 51 represents the years from 1965to 2015. For example, 1represents 1965 while 51 represents 2015. Thevertical values are the deviations from 50 years average annualprecipitation, minimum annual temperature, and maximum annualtemperatures. From Fig.1, the trend of the curve can indicate thatthe minimum deviation from 50 years average annual precipitation is-6.45 which occurred in the year 1968 while the maximum deviationfrom 50 years average annual precipitation is 9.29 which took placein 1978. 10.14 is the average annual rainfall for the 50 years. I caninfer that in 1968, San Diego received the lowest amount of rainfalland the highest in the year 1978. Further, 1968 can be considered asthe driest year and 1978 as the wettest year from all the 50 years.
Thetrend of the curve on the graph is inconsistent. For the first tenyears, the precipitation of several years was recorded below thetotal average up to 1977. From 1978 to 1995 the precipitation wasabove the overall average despite the years 1989, 1990 and 1994 inwhich the deviations were below the average. From 1996 up to 2015,San Diego had been receiving rainfall below cumulative average inmost of the years, especially since 2011 which has a consistentnegative deviation. In general, precipitation can be considered tohave been fluctuating irregularly above the grand mean, but there isconsistency for some years. I can predict that, the averageprecipitation for the year 2016 will be recorded above the grand meanof 51 years as observed from the trend of the curve. The city can beconsidered to have been receiving little rainfall.
Agraph representing deviation from 50 year averagelow temperatures against years
Thegrand average of low temperatures for the 50 years is 57.9 (ºF).Subtracting the value from each year’s annual average, 1965 had-2.7 (ºF) portraying that it was the coldest year. 1984 had thegreatest variation of 3.5 (ºF) for low temperatures meaning it wasthe hottest year according to how it is shown on Fig. 2. Most of theminimum average annual temperatures were below the grand average forthe 50 years. It indicates that, in San Diego, many years had coldtemperatures for the last half-century. The curve of the graph hassome regularity. For example, the deviations from 1965 to 1975 andfrom 1986 to 1995 are all below the grand average. The differencesare above the grand mean from 1976 to 1985 also depicts regularity.Irregularity is observed from 1996 to 2105.
Agraph representing deviation from 50 year averagehigh against years
Fromthe Fig.3 graph, the lowest deviation from 50 years high temperaturesis -2.8 (ºF) in 2001 while the highest is 3.5 (ºF) in 2015. Fromthe graph, I can consider the 2001 and 2015 as the coldest andwarmest years respectively when other factors remain constant. Theaverage high annual temperature was recorded below the grand mean forseveral years. It indicates that the temperatures are not too high inthe region. 74 (ºF) is the highest recorded mean annual temperaturewhich is moderate. There curve also have some regularity. Forexample, from 1976 to 1986, the differences are above the grand mean.From 1998 to 2013, is only on 2006 the deviation was above the totalaverage, the other years were below the grand mean.
Conclusively,by comparing the differences from the 50 years average precipitation,low and high temperatures, I can conclude that, San Diego had beenexperienced many cold and dry years from 1965 to 2015. From graphs,the deviations of the precipitation, low and high temperatures revealthat the city has cooler summers and warmer winters annually. Thefluctuations on all the trend curves are influenced by humid air thatstreams off the Pacific Ocean. I can also interpret that the regionhas cool and dry weather conditions because of lower precipitationand moderate temperatures. Therefore, San Diego might have beenexperiencing Mediterranean climate for the last 50 years. It can betrue because the city is located in the coastal and southerndistricts of California where the Pacific Ocean can influence thetemperature and humidity. The favorable climatic conditions canattract tourists to the city which also borders a coastline.