January Summary

Well above average temperature, above average rainfall.

  • January was well above my average temperature of 16.8C with 19.2C, the warmest January was 2018 with 19.5C, the coldest was 2001 with 13.3C.
    • The warmest temperature was 34.7C, my January record is 37.2C set in 2009
    • The coldest temperature was 6.1C, the lowest January temperature I've recorded is 3.5C in 2003.
    • Twenty nine days reached or exceeded 20C, my average is 22, a new January record.
    • Eighteen days reached or exceeded 25C, my average is 10.
    • Eleven days reached or exceeded 30C. my average is 3. This is a new January record which exceeds last years record January which had 9 days at or over 30C.
  • Wind run was 96% of my average of 5626km with 5422km.
    • The windiest January was 2017 with 6451km.
    • The southerly gust of 76km/h recorded on the 23rd was a new wind speed record for January.
  • The barometer recorded near average pressure for the month with 1009.4hPa. My average is 1010.3hPa.
  • Rainfall was 136% of the average expected total of 43mm with 58.2mm.
    • The wettest January in my records was 2018 with 104mm.
    • The driest January I've recorded is 2015 with 12mm.
January 2019 Summary
Temperature
Mean 19.2 C
Mean Maximum 26.8 C
Mean Minimum 13.6 C
Maximum High 34.7 C (23rd)
Maximum Low 18.1 C (31st)
Minimum High 18.0 C (14th)
Minimum Low 6.1 C (24th)
Wind Speed and Direction
Maximum Gust 76 km/h (23rd)
Mean 7.6 km/h
Wind Run 5422 km
Max Daily Windrun 307 km (14th)
Prevailing Direction East North East
Barometer
Maximum 1028.6 hPa (12th)
Minimum 985.9 hPa (23rd)
Mean 1009.4 hPa
Max Daily Change -22.3 hPa (13th)
Rainfall
Days with Measured Rainfall
(0.2mm or more)
8
Max Daily Rainfall 33.6 mm (14th)
Monthly Rainfall 58.2 mm
Humidity
Maximum 100 % (14th)
Minimum 22 % (20th)

January Daily Observations
TemperatureWindRainfallBarometer
DateMinMaxMeanMean
(Km/h)
Gust
(Km/h)
Run (km)Prevailing Dir10 Minute Max (mm)Total (mm)Min (hPa)Max (hPa)Change (hPa)
1 15.3 25.3 18.6 5.3 27 121 East Nth East 0.8 1.8 1005.3 1016.2 -10.9
Early showers and morning drizzle clearing by midday with sunny intervals in the afternoon.
2 14.6 34.1 24.8 6.3 38 145 North Nth West 0 0 999.0 1005.3 -6.3
Variable high cloud but mostly sunny and very warm in the afternoon. North to NW winds.
3 13.1 33.9 20.9 5.4 40 123 East Nth East 0 0 999.3 1008.1 +8.8
Sunny and very warm until a cooling southerly change in the afternoon arrived with increasing cloud. A few spots of drizzle in the evening.
4 12.8 28.1 18.5 7.1 34 162 East Nth East 0 0 1007.1 1017.6 +10.5
Light variable winds in the morning turning cooler NE in the afternoon, some cloud but mostly sunny.
5 15.3 28.3 21.8 9.7 37 222 East Nth East 0 0 1003.8 1017.1 -13.3
Sunny and very warm with nor'east winds turning nor'west in the evening with increasing high cloud.
6 14.0 27.6 20.8 10.3 39 233 West 0.8 3.0 1001.6 1010.2 +8.6
Warm morning, maximum temperature recorded at 8am. A cooler southerly change arriving just after 8am with cloud increasing in the afternoon and a period of rain in the evening. Near record warm overnight temperature recorded according to this Stuff article Canterbury sweats through one of its hottest nights on record.
7 13.4 21.8 17.2 8.7 33 198 East Nth East 0.4 2.8 1010.4 1014.7 +4.3
Morning drizzle clearing by midday to a sunny afternoon with NE winds.
8 12.5 26.6 18.2 7.6 36 173 East Nth East 0 0 1013.8 1021.9 +8.1
Cloud breaking to s mostly sunny afternoon. Warm with southerly winds turning NE from mid afternoon.
9 16.0 29.6 20.8 12.3 41 282 East Nth East 0 0 1005.5 1021.5 -16.0
Hazy with variable cloud and a fresh NE wind easing in the afternoon and turning warm nor'west.
10 15.3 33.5 22.1 7.3 34 168 South Sth West 0.2 0.2 1003.6 1009.0 +5.4
Morning showers clearing to a sunny and very warm morning with the maximum temperature recorded at 11:30am. Southerly winds from midday but remaining fine.
11 12.3 22.6 16.1 5.4 26 123 South Sth West 0.4 4.2 1009.3 1025.7 +16.4
Morning fog clearing with broken cloud with westerly winds turning southerly in the morning. Afternoon shower with light rain and drizzle in the evening.
12 11.7 18.6 14.9 6.3 32 142 East Nth East 0.4 2.8 1020.6 1028.6 -8.0
Morning light rain and drizzle clearing by midday but remaining overcast with NE a wind.
13 13.6 30.2 19.5 8.1 34 185 East Nth East 1.8 4.4 998.1 1020.4 -22.3
Broken cloud in the morning with NE winds, a brief change to warm northerly winds around 1 pm pushed the temperature up to 30,2C. Cloud increasing in the afternoon with a few spots of rain and further showers later in the evening.
14 10.4 18.0 12.8 13.4 41 307 South Sth West 2.4 33.6 1003.1 1015.4 +12.3
Morning rain with fresh westerly winds turning southerly. Rain easing by late morning and clearing in the afternoon with cloud breaking. Cloud returning in the evening but remaining dry.
15 12.2 20.8 15.1 6.3 25 144 South Sth West 0 0 1014.8 1019.0 +4.2
Morning cloud breaking in the afternoon with increasing sunny spells, light southerly winds.
16 9.1 20.8 15.7 7.6 37 175 East Nth East 0 0 1008.3 1019.0 -10.7
Mostly clear and sunny with some high cloud in the afternoon. NE wind.
17 14.2 23.4 18.2 8.1 30 185 East Nth East 0 0 1003.8 1008.3 -4.5
Variable cloud but mostly sunny, NE wind.
18 15.5 22.4 18.3 6.1 24 138 West 0 0 1007.7 1013.0 +5.3
Mostly cloudy but sunny intervals in the afternoon, westerly winds turning southerly in the afternoon and to NE in the evening.
19 15.6 32.0 21.8 9.4 50 215 East Nth East 0 0 989.5 1011.5 -22.2
Variable high cloud with sunny intervals. NE winds with a change to very warm nor'west from mid afternoon.
20 11.0 30.0 20.5 6.5 34 149 North Nth West 0 0 990.3 1000.8 +10.5
Some high cloud but mostly sunny and warm with variable winds tending warm northerly from midday.
21 13.2 27.3 18.9 4.5 27 102 East Nth East 0 0 993.4 1006.0 +12.6
Variable high cloud with sunny intervals and mostly light north to NE winds.
22 12.9 32.3 21.9 7.5 38 171 East Nth East 0 0 998.9 1006.8 -7.9
Morning cloud clearing by midday. NE winds turning warm north to nor'west from mid afternoon.
23 10.7 34.7 22.9 11.3 76 259 North Nth West 0.8 4.8 985.9 1004.0 +18.1

Very warm nor'west winds from morning with the temperature reaching 30C but about 10am. Wind strong and gusty in the afternoon. A strong colder southerly change in the evening with a period of rain arriving in the evening. The maximum gust of 76km/h when the southerly arrived is the highest wind speed I've recorded since 29 May 2014.
Some media stories on the southerly change, 
Christchurch's fallen trees and branches will take a week to clean up

Why was Wednesday's southerly change so severe?

In pictures: Southwesterly squall brings high winds and damage in South Island

24 6.1 22.1 14.2 5.8 34 131 East Nth East 0.2 0.2 1004.3 1017.5 +13.2
Chilly morning. Partly cloudy with southerly winds turning NE in the afternoon. Evening shower.
25 10.0 20.8 15.7 6.2 33 140 East Nth East 0 0 1012.9 1017.6 -4.7
Mostly overcast with high cloud but some sunny intervals. NE wind.
26 14.8 22.5 18.1 6.2 39 140 East Nth East 0 0 1000.5 1013.8 -13.3
Partly cloudy morning, overcast in the afternoon, NE wind.
27 16.7 31.0 20.9 8.9 40 203 East Nth East 0 0 999.5 1010.2 +10.7
Maximum, temperature recorded at 9am before a cooler NE wind cooled things down to about 23C for the reset of the day. Sunny with variable high cloud.
28 16.7 31.7 21.8 7.4 38 170 East Nth East 0 0 1003.9 1019.3 +15.4
Some cloud at times but mostly sunny with southerly winds in the morning turning NE early afternoon.
29 16.6 23.4 19.5 7.7 35 175 East Nth East 0 0 1019.2 1020.6 +1.4
Cloud increasing in the morning and overcast by midday with a NE wind.
30 16.6 33.9 22.5 4.2 24 95 East Nth East 0 0 1018.3 1022.3 +4.0
Morning mist and fog clearing to a warm and sunny day with light breezes in the morning turning cooler NE in the afternoon.
NZ Herald story - Revealed: Where in New Zealand the heatwave is now an official one
31 18.1 24.7 20.7 10.0 39 229 East Nth East 0 0 1007.9 1021.9 -14.0
Sunny with NE wind freshening in the afternoon.

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January 2019  Temperature Graph
January 2019 Wind Dir Graph
January 2019 Wind Dir Graph
January 2019 Wind Speed Graph
January 2019 Rainfall Graph
January 2019 Barograph
January 2019 Humidity Graph