To understand the weather for SG over past years or months using library package - weatherData. Please read the pdf in the url below. It gives many comprehensive examples.
https://cran.r-project.org/web/packages/weatherData/index.html
suppressWarnings(suppressMessages(library(weatherData)))
station_id <- "SIN"
getCurrentTemperature(station_id) # check current temperature## Time TemperatureC
## 23 2016-09-04 09:30:00 30getDetailedWeather(station_id , Sys.Date()) #just the Temperature Columns## Time TemperatureC
## 1 2016-09-04 00:00:00 29
## 2 2016-09-04 00:30:00 29
## 3 2016-09-04 01:00:00 29
## 4 2016-09-04 01:30:00 29
## 5 2016-09-04 02:00:00 28
## 6 2016-09-04 02:00:00 28
## 7 2016-09-04 02:30:00 28
## 8 2016-09-04 03:00:00 28
## 9 2016-09-04 03:30:00 28
## 10 2016-09-04 04:00:00 28
## 11 2016-09-04 04:30:00 28
## 12 2016-09-04 05:00:00 27
## 13 2016-09-04 05:00:00 27
## 14 2016-09-04 05:30:00 27
## 15 2016-09-04 06:00:00 27
## 16 2016-09-04 06:30:00 27
## 17 2016-09-04 07:00:00 27
## 18 2016-09-04 07:30:00 27
## 19 2016-09-04 08:00:00 28
## 20 2016-09-04 08:00:00 29
## 21 2016-09-04 08:30:00 29
## 22 2016-09-04 09:00:00 30
## 23 2016-09-04 09:30:00 30#what columns are available ?
showAvailableColumns(station_id, Sys.Date(), opt_detailed=T)## columnNumber columnName
## 1 1 TimeSGT
## 2 2 TemperatureC
## 3 3 Dew_PointC
## 4 4 Humidity
## 5 5 Sea_Level_PressurehPa
## 6 6 VisibilityKm
## 7 7 Wind_Direction
## 8 8 Wind_SpeedKm_h
## 9 9 Gust_SpeedKm_h
## 10 10 Precipitationmm
## 11 11 Events
## 12 12 Conditions
## 13 13 WindDirDegrees
## 14 14 DateUTC# interested in columns 12 - Conditions
df <- getDetailedWeather(station_id, Sys.Date(),opt_custom_columns=T, custom_columns=12)
head(df,10)## Time Conditions
## 1 2016-09-04 00:00:00 Mostly Cloudy
## 2 2016-09-04 00:30:00 Mostly Cloudy
## 3 2016-09-04 01:00:00 Mostly Cloudy
## 4 2016-09-04 01:30:00 Mostly Cloudy
## 5 2016-09-04 02:00:00 Haze
## 6 2016-09-04 02:00:00 Mostly Cloudy
## 7 2016-09-04 02:30:00 Mostly Cloudy
## 8 2016-09-04 03:00:00 Mostly Cloudy
## 9 2016-09-04 03:30:00 Mostly Cloudy
## 10 2016-09-04 04:00:00 Mostly Cloudy#get 3 days temperature
d3 <- getWeatherForDate(station_id, start_date="2016-08-01", end_date = "2016-08-03", opt_detailed = TRUE, opt_all_columns = TRUE, opt_custom_columns=T, custom_columns = c(2,4,12))## Getting data from:
## http://www.wunderground.com/history/airport/SIN/2016/8/1/DailyHistory.html?format=1## The following columns are available for:2016-08-01## [1] "TimeSGT" "TemperatureC"
## [3] "Dew_PointC" "Humidity"
## [5] "Sea_Level_PressurehPa" "VisibilityKm"
## [7] "Wind_Direction" "Wind_SpeedKm_h"
## [9] "Gust_SpeedKm_h" "Precipitationmm"
## [11] "Events" "Conditions"
## [13] "WindDirDegrees" "DateUTC"## Getting data from:
## http://www.wunderground.com/history/airport/SIN/2016/8/3/DailyHistory.html?format=1## The following columns are available for:2016-08-03## [1] "TimeSGT" "TemperatureC"
## [3] "Dew_PointC" "Humidity"
## [5] "Sea_Level_PressurehPa" "VisibilityKm"
## [7] "Wind_Direction" "Wind_SpeedKm_h"
## [9] "Gust_SpeedKm_h" "Precipitationmm"
## [11] "Events" "Conditions"
## [13] "WindDirDegrees" "DateUTC"## Checking Data Availability For SIN## Found 28 records for 2016-08-01## Found 28 records for 2016-08-03## Data is Available for the interval.## Will be fetching these Columns:##
## Please note: Custom columns and opt_all_columns are both selected.
## Only custom columns will be returned.## [1] "Time" "TemperatureC" "Humidity" "Conditions"## Begin getting Daily Data for SIN
##
## Please note: Custom columns and opt_all_columns are both selected.
## Only custom columns will be returned.## SIN 1 2016-08-01 : Fetching 56 Rows with 4 Column(s)##
## Please note: Custom columns and opt_all_columns are both selected.
## Only custom columns will be returned.## SIN 2 2016-08-02 : Fetching 56 Rows with 4 Column(s)##
## Please note: Custom columns and opt_all_columns are both selected.
## Only custom columns will be returned.## SIN 3 2016-08-03 : Fetching 56 Rows with 4 Column(s)#display column 2, 4 and 12 as stated above
head(d3,20)## Time TemperatureC Humidity Conditions
## 1 2016-08-01 00:00:00 26 89 Mostly Cloudy
## 2 2016-08-01 00:30:00 26 89 Mostly Cloudy
## 3 2016-08-01 01:00:00 26 89 Mostly Cloudy
## 4 2016-08-01 01:30:00 26 94 Mostly Cloudy
## 5 2016-08-01 02:00:00 26 86 Haze
## 6 2016-08-01 02:00:00 26 94 Mostly Cloudy
## 7 2016-08-01 02:30:00 26 94 Mostly Cloudy
## 8 2016-08-01 03:00:00 26 94 Mostly Cloudy
## 9 2016-08-01 03:30:00 26 94 Mostly Cloudy
## 10 2016-08-01 04:00:00 26 94 Clear
## 11 2016-08-01 04:30:00 26 94 Clear
## 12 2016-08-01 05:00:00 26 92 Haze
## 13 2016-08-01 05:00:00 26 94 Mostly Cloudy
## 14 2016-08-01 05:30:00 26 94 Mostly Cloudy
## 15 2016-08-01 06:00:00 26 94 Mostly Cloudy
## 16 2016-08-01 06:30:00 25 100 Mostly Cloudy
## 17 2016-08-01 07:00:00 27 84 Mostly Cloudy
## 18 2016-08-01 07:30:00 27 79 Mostly Cloudy
## 19 2016-08-01 08:00:00 28 70 Haze
## 20 2016-08-01 08:00:00 28 74 Mostly Cloudy# shows temperature for year 2016 (min, max and mean temperature)
year_temperature <- getWeatherForYear(station_id, 2016)## Retrieving from: http://www.wunderground.com/history/airport/SIN/2016/1/1/CustomHistory.html?dayend=4&monthend=9&yearend=2016&req_city=NA&req_state=NA&req_statename=NA&format=1## The following columns are available:## [1] "SGT" "Max_TemperatureC"
## [3] "Mean_TemperatureC" "Min_TemperatureC"
## [5] "Dew_PointC" "MeanDew_PointC"
## [7] "Min_DewpointC" "Max_Humidity"
## [9] "Mean_Humidity" "Min_Humidity"
## [11] "Max_Sea_Level_PressurehPa" "Mean_Sea_Level_PressurehPa"
## [13] "Min_Sea_Level_PressurehPa" "Max_VisibilityKm"
## [15] "Mean_VisibilityKm" "Min_VisibilitykM"
## [17] "Max_Wind_SpeedKm_h" "Mean_Wind_SpeedKm_h"
## [19] "Max_Gust_SpeedKm_h" "Precipitationmm"
## [21] "CloudCover" "Events"
## [23] "WindDirDegrees"## Checking Summarized Data Availability For SIN## Found 248 records for 2016-01-01 to 2016-09-04## Data is Available for the interval.## Will be fetching these Columns:## [1] "Date" "Max_TemperatureC" "Mean_TemperatureC"
## [4] "Min_TemperatureC"# display first 5 rows and last 5 rows
head(year_temperature,5); tail(year_temperature,5)## Date Max_TemperatureC Mean_TemperatureC Min_TemperatureC
## 1 2016-01-01 29 27 24
## 2 2016-01-02 28 26 23
## 3 2016-01-03 27 24 23
## 4 2016-01-04 32 28 24
## 5 2016-01-05 32 29 26## Date Max_TemperatureC Mean_TemperatureC Min_TemperatureC
## 244 2016-08-31 32 28 24
## 245 2016-09-01 31 28 25
## 246 2016-09-02 31 28 24
## 247 2016-09-03 32 29 26
## 248 2016-09-04 30 28 27# shows temperature for 3 days : Aug 1st 2016 to Aug 3 2016
getWeatherForDate(station_id, "2016-08-01", "2016-08-03")## Retrieving from: http://www.wunderground.com/history/airport/SIN/2016/8/1/CustomHistory.html?dayend=3&monthend=8&yearend=2016&req_city=NA&req_state=NA&req_statename=NA&format=1## The following columns are available:## [1] "SGT" "Max_TemperatureC"
## [3] "Mean_TemperatureC" "Min_TemperatureC"
## [5] "Dew_PointC" "MeanDew_PointC"
## [7] "Min_DewpointC" "Max_Humidity"
## [9] "Mean_Humidity" "Min_Humidity"
## [11] "Max_Sea_Level_PressurehPa" "Mean_Sea_Level_PressurehPa"
## [13] "Min_Sea_Level_PressurehPa" "Max_VisibilityKm"
## [15] "Mean_VisibilityKm" "Min_VisibilitykM"
## [17] "Max_Wind_SpeedKm_h" "Mean_Wind_SpeedKm_h"
## [19] "Max_Gust_SpeedKm_h" "Precipitationmm"
## [21] "CloudCover" "Events"
## [23] "WindDirDegrees"## Checking Summarized Data Availability For SIN## Found 3 records for 2016-08-01 to 2016-08-03## Data is Available for the interval.## Will be fetching these Columns:## [1] "Date" "Max_TemperatureC" "Mean_TemperatureC"
## [4] "Min_TemperatureC"## Date Max_TemperatureC Mean_TemperatureC Min_TemperatureC
## 1 2016-08-01 31 27 23
## 2 2016-08-02 32 28 23
## 3 2016-08-03 30 26 22