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Weather Summary for 2018

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RayProudfoot
Posts: 2667
Joined: Wed 06 May 2009 6:29 pm
Weather Station: Davis VP2 with Daytime FARS
Operating System: Windows XP SP3
Location: Cheadle Hulme, Cheshire, England
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Weather Summary for 2018

Post by RayProudfoot » Tue 01 Jan 2019 10:18 am

It would be interesting to read weather reports for 2018 from other stations around the world. Here in the UK we had a very warm and dry summer preceeded by a cold blast in late Feb / early March named by the media as "the beast from the east". :D

For my station here in Cheshire, England here are the headline stats for an interesting year...

Hottest Day 31.6C on 26 June. The all-time record of 32.1C on 1 July 2015 still stands.
Coldest Day -0.4C 1 March.
Warmest Night 17.7C on 1/2 September.
Coldest Night -6.3C on 27/28 February.
Lowest Windchill -10.6C 28 February.
Wettest Day 0.87” (22.1mm) on 20 September.
Highest Rainfall Rate 3.76” (95.5mm)/hr on 24 January.
Wettest Month January with 3.91” (99.3mm).
Driest Month June with 0.22” (5.6mm).
Longest Dry Period 26 days. 17 June – 12 July.
Longest Wet Period 8 days. 14-21 January.
Highest Gust 53mph 1 March.
Highest 10-minute Wind Speed 24mph 12 October.
Lowest Humidity 22% 28 June.
Highest Pressure 1039.5hPa 22 October
Lowest Pressure 981.5hPa 3 January
Annual Rainfall 24.89” (632mm). A new record for this station. In comparison 2012 had 40.26” (1023mm).

Period of Greatest Heat 24 June to 16 July. Maxima exceeded 24C on every day.

Maxima of 30C or higher on 25, 26, 28 and 29 June and 1, 26 and 27 July.

There were 92 days when the maxima reached or exceeded 21C. Previous record was 66 in 2014 and 59 in 2013.

The temperature reached 21C in every month from April to October. Last achieved in 2011.

There were 158 days with recorded rain. The lowest since I started keeping records in May 2009. In comparison 2012 – the wettest - had 203.

Every month had below average rainfall except January, April and September. June had just 8% of the average, November 40%, May 50%, October 59%, August 63%, July 72%, March 84%, February 89% and December 91%. September had 113%, January 139% and April 156%.

The average temperature for 2018 was 11.1C, just 0.2C higher than 2017. The very warm summer was offset by a cold late winter / early spring.
Cheers,
Ray, Cheshire.

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Mapantz
Posts: 565
Joined: Sat 17 Dec 2011 11:55 am
Weather Station: Davis Vantage Pro2
Operating System: Windows 10 x64
Location: null

Re: Weather Summary for 2018

Post by Mapantz » Tue 01 Jan 2019 11:00 pm

wow - that's low rainfall compared to here.

December was the wettest month I have recorded on this station. 189.8mm. November and December combined was 336.2mm. Total for the year was 994.2mm. 166 rain days. Sunshine was way above average though 1689.1 hours recorded and that figure is on the low side.
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jrhilton
Posts: 17
Joined: Thu 31 Jul 2014 4:25 pm
Weather Station: Custom build + old Oregon WMR88
Operating System: Windows 10 / Linux
Location: London

Re: Weather Summary for 2018

Post by jrhilton » Wed 02 Jan 2019 2:33 pm

2018 was an interesting year for us here in suburban SW London. The garden is fairly sheltered as it is an suburban environment and is a bit of a sun trap. Temperature measurements taken in a Stevenson screen (older wood one and not the current plastic spec one) and are probably slight high in the summer as we have a tall wood fence round the garden which limits wind slightly, but represents the temperature in the center of the garden well. Wind anemometer is at about 10m off the ground and is unobstructed by buildings/trees and the rain gauge is a tipping bucket version and again is not obstructed.

49 days of air frost (Jan:4, Feb:19, Mar: 11, Oct:3, Nov:4, Dec:8) vs 61 in 2017.
2 days where it never went above freezing in March vs nil in 2017.
66 days where the high was above 27(c) (Apr:3, May:6, Jun: 16, Jul:26, Aug:13, Sep:2) vs 39 in 2017
A record low temperature of -9.4(c) on 28th feb (I started taking records here in 2014).
A high of 37.6(c) on 23 July - 38(c) is my all time high on 24/8/16.

Total rain of 525.1mm which is below average and below 588.8mm in 2017 which was very close to long term London average.

Highest wind was 32mph(18 jan) and the average was 3.6mph vs 3.8mph in 2017.

Record longest wet period of 10 days in April and record longest dry period of 52 days starting from July (it is a tipping bucket gauge so could have missed some small <1mm amounts of rain).

Sun hours and soil temperatures not yet analysed.

Matt.j5b
Posts: 439
Joined: Mon 28 Nov 2011 2:13 am
Weather Station: Davis VP2 DFARS+La Crosse WS2306
Operating System: Windows 10 64 Bit
Location: Ferny Grove, Brisbane, Australia
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Re: Weather Summary for 2018

Post by Matt.j5b » Mon 28 Jan 2019 11:40 am

2018: Warm days, cool nights and average rainfall.

During 2018 mean night-time temperatures were below average and the lowest in 5 years. Mean day-time temperatures were above average. Rainfall was near average during the year. There were 29 thunderstorms with 5 being severe.

Note: Rainfall totals are from a manual gauge measured as 24 hours to 9am , except for rainfall rate and hourly rain (midnight to midnight). Station in operation since 2009 and earlier for manual rainfall.

Temperature:
Mean minimum temperature: 14.4 ºC, 0.6 ºC below average and 0.6 ºC lower than 2017 (lowest since 2013 and equal second lowest)
Mean maximum temperature: 27.4 ºC, 0.3 lower than 2017, 0.9 ºC above average
Mean temperature: 20.9 ºC, 0.5 C lower than 2017, 0.1 ºC above average (lowest since 20.8 ºC in 2015)
Lowest temperature: 1.8 ºC at 6:59 AM on 15 July 2018 (lowest since 1.7 ºC on 9 July 2014). 2017 was 2.9 ºC.
Highest temperature: 39.8 ºC at 2:47 PM on 21 December 2018 (the highest on record for December and the third highest annual temperature on record. 2017 was 40.5 ºC.
Lowest maximum temperature: 16.4 ºC at 2:03 PM on 27 June 2018 (the second highest on record). 2017 was 16.9 ºC.
Highest minimum temperature: 25.2 ºC at 6:15 AM on 13 February 2018 (the second highest on record). 2017 was 26.8 ºC.

There were 7 months of close to average mean monthly temperatures (within 0.5 ºC of the site average) and 3 months were above average (March, April and July) of between 0.8 and 1 ºC above average. 2 months were below average (September and October) which were 0.7 ºC below average.

For minimum temperatures 6 months were below average (January, May, June, July, August, September and October), 2 months above average (March and October) and 4 months within 0.5 ºC of the site average.

Maximum temperatures saw 7 months above average with January 2.1 ºC above average, April, June and August were 1.4 ºC above average and May was 1.7 ºC above average. July was 2.3 ºC above average while November was 0.6 ºC above average. 3 months were within 0.5 ºC of the site average and 2 months were below average (August and September)

In February a hot spell of maximum temperatures that were 4 to 7 ºC above average (up to 37 ºC) was recorded between the 10th and 16th. In early March there was a long run of cool days. Cold nights of 3 to 5 ºC below average were observed between the 16th to 25th of June. There were several cold spells from mid-July into August with very few warm nights during this period. In June there was a 9 day period of high maximum temperatures from the 8th. The mean minimum temperature for winter of 7.6 ºC is a new record low (old record was 8.1 ºC in 2012) while the winter mean maximum temperature of 23.5 ºC equals the current record of 23.5 ºC in 2017.

From the 1st to 20th September most nights were cooler than normal by up to 5 ºC below average, while many daytime temperatures were also cooler than normal. By contrast, most nights in October were warmer than normal, associated with the wet weather. Daytime temperatures in October were close to or cooler than normal before warm days later in the month. In November there were many cool nights, the lowest was 5 ºC below average, while most days were warmer than normal. In December there was a warm spell of 9 nights from the 14th.

Mean minimum grass temperature: 13.3 C ºC, 0.9 ºC higher than 2017.
Lowest minimum grass temperature: 0.9 ºC on 14 August 2018, 2017 was 1 ºC.
Highest minimum grass temperature: 24.0 ºC on 13 February 2018 (this coincided with the highest minimum temperature for the year). 2017 was 24.9 ºC.

Mean sea level pressure
Mean minimum MSL pressure: 1013.9 hPa, 0.3 hPa lower than 2017
Mean maximum MSL pressure: 1018.9 hPa, 0.2 hPa lower than 2017
Mean MSL pressure: 1016.4 hPa (0.1 hPa above average), 0.3 hPa lower than 2017
Lowest MSL pressure: 995.0 hPa on 28 November 2018 at 1:52 PM. This is a new record low annually and for November. The previous all time record low was 995.3 hPa on 30 March 2017 at 7:56 PM with the passage of Ex – Tropical Cyclone Debbie
Highest MSL pressure: 1030.7 hPa on 26 June 2018 at 9:37 AM (the highest since 1034.4 hPa in 2016). 2017 was 1030.2 hPa.

Relative humidity
Mean minimum relative humidity: 49.3 %, 3.3 % below average, 1.6 % lower than 2017, second lowest on record and lowest since 38.3 % in 2009
Mean maximum relative humidity: 89.1%, 1.1 % below average, 0.5 % lower than 2017, third lowest on record and lowest since 85.1 % in 2016
Mean relative humidity: 69.2 %, 2.3 % below average, 3.3 % lower than 2017 and the lowest since 68.4 % in 2016
Lowest relative humidity: 10% on 24 November 2018 at 2:44 PM, equal lowest on record (10% on 5 December 2012 at 5:15 PM). New record low for November exceeding old record of 17% on 7 November 2016 at 12:55 PM. 2017 was 20%.

Dew point
Mean minimum dew point: 12.0 ºC (1.1 ºC below average)
Mean maximum dew point: 17.5 º (0.9 ºC above average)
Mean dew point: 14.8 ºC (0.1 ºC above average)
Lowest dew point: -4.8 ºC on 21 August 2018 at 3:41 AM. This is the lowest on record annually and for August exceeding the previous record of -3.4 ºC on 2 August 2014 at 1:56 PM.
Highest dew point: 27.2 ºC on 14 February 2018 at 2:40 PM

Wind
Highest wind gust: 99.8 km/hr on 11 February 2018 at 6:24 PM. This is a new record high annually and for February with the old record for February being 60.9 km/hr on 9 February 2017 at 2:45 PM
Highest wind speed: 45.7 km/hr on 8 September 2018 at 7:38 AM, the lowest since 44.1 km/hr in 2013. 2017 was 46.2 km/hr.
Total wind run: 21,658.7 km (highest on record, old record was 20,494.6 km in 2016). This is 4553.1 km higher than 2017.
Mean wind speed: 2.5 km/hr, 0.4 km/hr lower than 2017 (highest on record, old record was 2.4 km/hr in 2016)
Dominant wind direction: SE (SSE in 2017).

Rainfall
Rainfall total: 1121.7 mm, 1.7 mm above average (+0.2 % above average), 0.5% below the site median, and 2017 was 1158.9 mm. Automatic rain gauge was 993.1 mm (-11.4 % of manual gauge).

Highest daily rainfall total: 143.4 mm on 24 February 2018. This is the highest since 158.9 mm in 2 May 2015. This total was from showers that increased to rain periods with moderate to heavy falls for 3 hours from 6:30 pm and then easing to light rain on the 23rd. This was followed by moderate to heavy rain periods until 3 am on the 24th.

Number of rain days (0.1 mm or greater): 140 days (3.5 days above average), and 1 greater than 2017
Highest rain fall rate: 273.4 mm/hr on 26 February 2018 at 8:35 PM
Highest hourly rainfall total: 44mm on 26 February at 8:47 PM.

Wettest month: 263.7 mm in October (189.6 mm above average and 479.1 % of the average).
Driest month: 17.1 mm in August (13.3 mm below average, 48.4 % below average but 1.8 % below the site median rainfall)

There were 29 thunderstorms, with 5 being severe with 29 days with thunder, along with 10 nearby thunderstorms.

January rainfall was lowest since 2009 and 43.2 % of the site average with a total of 62.4 mm. In February there was 305.3 mm of rain (182.9 % of the site average) produced by showers, rain periods and 6 thunderstorms with 2 being severe (4 days of thunder) along with heavy rain and some strong winds. Above average rainfall continued in March (182.1 % of the site average) with 25 rain days (12.7 days above average) produced by showers along with thunderstorms. The rain eased from April to August with April 34.4 % of the site average and May was 46.6 %, June was 44.7 %, July was 46.8 % and August was 51.6 %. Winter rainfall was 63.9 mm (47.1 % of the site average) and the lowest since 12.5 mm in 2004.

September rainfall was close to average (1.3% above average) on 9 days (3.4 days above average) with thunderstorm activity returning later in the month. Rain in October was very high with regular showers, rain periods and thunderstorms with heavy falls over most of the month. The dry weather returned in November which was only 25 % of the site average which is lowest since 18.1 mm in 2011. Though there were thunderstorms, the usual severe thunderstorm activity in November didn’t occur this year. December rainfall was close to the site median rainfall but was 55.8 % of the average with 13 rain days (2.8 days above average) with shower and thunderstorm activity with little rainfall in the last 10 days of the year.

On an annual, monthly and seasonal (autumn, winter and spring) basis there were 49 existing records exceeded, along with 80 records that were highest/lowest in at least 5 years.
2018 summary.PNG
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Regards, Matt of Brisbane, Australia
Ferny Grove Weather
Cumulus MX testing

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PaulMy
Posts: 1812
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Weather Station: Davis Vantage Pro 2+ w/Envoy USB
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Re: Weather Summary for 2018

Post by PaulMy » Mon 28 Jan 2019 3:11 pm

Hi Matt,
We spoke to our son and grandsons on December 21st in the morning (we FaceTime every Friday morning) and I remember him saying that it was quite hot there in Brisbane.

Our 2018 was quite typical...
cumulus-2018.png
Enjoy,
Paul
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