|First light / Sunrise||07:13 / 07:53|
|Sunset / Last light||16:30 / 17:10|
|Station uptime:||411 days, 9 hours, 40 minutes|
|Server uptime:||411 days, 9 hours, 38 minutes|
Buried at the bottom of the pages that make up 'The Weather' tab (Last 24 hours, This week, This Month, This Year) are measures of how much sunshine we've had. I'm looking at the graph at the bottom of the 'Last 24 hours' page and it confirms that there has been no sunshine at all today (14 Jan 2018). On the 'This week' page you can see that there has been only two hours of sunshine in the last week, most of it on January 7th. The 'This month' page shows that there have been fourteen days in the last month with no sunshine. So it has officially been gloomy.
The graph below shows the average monthy temperatures in Royston since 1973 - incorporating Iceni data for 1973 to 2009 - see article below. In the first half of 2017 we had average temperatures for three of the months verging on the highest for 43 years. September was on the cold side but October was warm.
Comparing monthly rainfall with average shows that April had exceptionally low rain and the autumn was also a bit lower. The annual total was 498mm compared with an average over the years of 590mm.
For a number of years weather data was collected just outside Royston using a "proper" weatherstation - a "Stephenson screen", a box with louvred panels on legs, in an open area. Data was collected and displayed from May 1972 to July 2013. The information was displayed in graphical and numerical form and is still available on the internet at Royston Iceni Site I have added this data to the analysis of monthly average temperatures in the above article
It seems that the rain collector gets blocked quite easily - 5 months since the last stoppage it has happened again. The drip feed showed again - like the image under the March 1 entry below. Then a total stoppage just before one of the wettest days this year, August 9th. I was away so could only fix it on August 10 - poke a narrow wooden skewer into the exit hole and all is let loose so the 18.2mm showing on Aug 10 really belongs in Aug 9. The week and month total will be correct. The manual says clean the collector several times a year so I'm planning every 4 months. Watch this space
Apologies to Sun Hill weather data followers for the outage between 02:05 on Saturday June 17th to 18:40 on Sunday June 18th. This was due to a hot and bothered router (see next item on record temperature) deciding that an internet connection was just too much trouble. When I returned on the Sunday night the usual turn it off and on again did the trick. A friend is now on standby to repeat this technical task should it happen again whilst I am away.
Whilst I only have 8 years of Sun Hill data June 18 was a record high for June of 32.8C - see the History tab. The month is also shaping up to be the highest average temperature as was May 2017. The UV factor topped 8 over the weekend - see below for an explanation of the implications of this high value
William of Ockham, a Franciscan friar who studied logic in the 14th century, is known for principle called Occam's razor: If there are several proposed explanations for an occurrence the simplest one is usually the best.
What has this got to do with weather stations? Eagle eyed followers of the Sun Hill Weather Station have commented on the rainfall pattern pictured below.
I came up with convoluted explanations to do with fog, condensation and melting ice. Last night it all came to a head when I was out running and the heavens opened. How much rain? I wondered. None said the station. But all night a steady drip of 0.2mm the smallest measurable amount of rain. So this morning it was time for the overdue service of the station. The rain cone still had quite a lot of .2s of rain as the hole was blocked with a paste of roof tile dust which greatly constricted the water flow. After a wash and brush up and change of back-up battery we are back in business and waiting to see what happens with the next rain. So the simplest explanation, barely considered, proved to be the answer. And those that RTFM would know that a rain funnel clean is recommended every four months or so.
There have been two weather records in four days - see below - Maybe rain will be next
13:46 We have just had a gust of 54mph which breaks the 2010 record of 43mph by a long way. Forecast for the area is gusting to 60mph all afternoon - watch this website
The temperature reached 16.9C on February 20th, the hottest February day in the Sun Hill database. Look at the History page on the website - Average Monthly Values where a monthly figures are summarised
Yesterday there was a tornado in Wales with winds up to 94mph. Nothing like that here but we did have a quick gust of 38mph which is in the region of our greatest ever gust of 43mph - See Stats page . The blast of wind was accompanied by a downpour. See "This week" or "This month" pages.
The hours of daylight information has been expanded to give an estimate of the length of twilight each day. Previously Sunrise and Sunset was given. Now First Light and Last Light are given to show the periods before sunrise and after sunset when light can be seen in the sky.
Technically these are measures of Civil Twilight. Definitions of civil twilight and nautical twilight can be found at Time and Date
It has just been on the news that 2016 is the hottest year on record. The Royston weather station has now been recording information for just short of seven years, so whilst I can't comment on global warming in Royston there have been some interesting variations.
I quite often look at the History page on the website - Average Monthly Values where a monthly summary is given for various measures. These are colour coded to show how they vary but to get a much better view of the variation a graph helps.
The graph shows the average temperature for each month in 2016 plus the highest and lowest recorded for each month.
May, August and September set new record monthly highs with June and July also near the top of the range.
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On the week and month tabs, down near the bottom are now tables giving the hours of sunshine per day - thanks to Nick for adding the calculations to do this.
Sunshine hours are calculated using this service: radiationhours.py.
The new Vantage Pro weather station reports radiation as (Watts per square metre). This is the amount of solar heat hitting the earth where the weather station is located. At Earths average distance from the Sun (about 150 million kilometres), the average intensity of solar energy reaching the top of the atmosphere directly facing the Sun is about 1360 watts per square meter.
Energy from sunlight is not spread evenly over Earth. One hemisphere is always dark, receiving no solar radiation at all. On the daylight side, only the point directly under the Sun receives full-intensity solar radiation. From the equator to the poles, the Suns rays meet Earth at smaller and smaller angles, and the light gets spread over larger and larger surface areas (red lines)
According to World Meteorological Office if solar radiation exceeds 120 Watts per square metre then it is deemed to be sunny. So if the graph shows more than 120 it is sunny in Royston.
UV is the main component of light that gives you sunburn. The Vantage Pro reports an index value in line with the WHO guidance on sun protection.
The rain data that was spuriously generated by the old weather station has now been removed.
The new Davis Vantage Pro 2 has now been erected into its long term home and is now contributing data to this site. Solar radiation and UV strength is now being reported although this will take a bit of time to build up. When I get a minute some of the test data from the start of the year will be transferred.
Santa came early this year with a new weather station. It's a Davis Vantage Pro 2 Plus the plus bit indicating that it has got two more sensors to measure solar radiation (sunshine) and UV (ultraviolet)
The kit has a more rugged and accurate rain gauge but the real selling point is that the anemometer can be erected at a distance from the rest of the sensors. The pictures below show "what's in the box" and the high tech testbed installation.
With the anemometer distant from the rain gauge I should not get the spurious rain readings mentioned in news below.
If you click here Station under test you can see readings from the new unit. Rain, temperature, humidity, solar and UV should be pretty accurate but the wind readings will be very low in its sheltered conditions. I plan to erect the new station in the new year when I can round up sufficient ladder holders and climbers.
Not very far - Just upstairs. You may have been following the toaster/UPS story below. There is a problem with my downstairs electrical ring main which occasionally trips the circuit board cutting off the power to downstairs and in particular to the Raspberry Pi. This came to a head in September 2015 when the power dropped off when I was away on holiday and the Pi was down until I got back to find that the Pi had got its memory corrupted and had to be rebuilt. Various items have been blamed for the electricity failure including the toaster, kettle and table lamp but all plead not guilty. Many electrician hours have been spent in testing everything and head scratching but no fault has ever been found. So I decided to move the Pi upstairs onto a different circuit. Well not so much move it as buy a new one with sufficient USB ports to add a wi-fi dongle as the existing one is cabled to the router next to it. I now have a latest model Pi with wi-fi dongle and 8GB memory stick which acts as data backup. I've just plucked up courage today to turn off the old Pi and move the data upstairs to the new one. So far so good ......
Phantom rain for November 15 and 17 has been removed. Management is looking for a less shaky mounting pole
The rain readings for November 17th are wrong. It looks like the very high winds we are having today are shaking the Davis unit violently, rattling the rain recording cup and making it look like an Ark will soon be needed. Head scratching going on. If the wind gusts are in the 30mph region have a glance at the humidity reading, if this is not 90%+ then the odds are the rain reading is wonky
The batteries lasted 20 days before they went flat. A test of the UPS by pulling out the power lead crashed the Pi. We admit defeat and will try to get our money back
The supplier sent a replacement UPS. The Pi skated through a toaster induced crash and also an investigation into using a plug mounted earth leakage trip (The main circuit board trips before the plug mounted one). How long will the batteries last?
UPS was a dead loss - back-up AA batteries went flat within a week. After some to-ing and fro-ing the supplier is sending a replacement. Watch this space
Click on the images to see the full size plots.
I finally got fed up with the battle with the toaster - see below - and decided to do something about it. The answer to my problems is (hopefully) an uninteruptable power supply and after some searching I found a UPS from a German Company. It is a circuit board which sits on top of the Pi and is connected to collection of AA batteries:
The spring time change confused the system. It didn't stop working but decided it liked the data for 2am Sunday March 30th so much that it would keep on publishing it. Guru Nak applied a dose of salts clearing the blockage and now all is well again
One of the graphs on this site has always annoyed me - the temperature one on the Year summary page. It has always shown the average temperature for each day of the year and I'm sometimes not sure what averages bring to the discussion. Did you know that men in the UK have on average 1.96 legs. Anyway I've changed it to give the high and low temperature on each day. When I say "I've changed it" I mean I had a good hack and then called the Pi guru Nak. I wasn't helped by there being a typo in the manual and the fact that the # sign in Python means ignore this line whereas in html it means this is a sign. If you have any thoughts on the matter send me an email: email@example.com.
If you are reading this at the start of 2014 it looks like it was unseasonably warm on January 2nd. This was the day for annual maintenance and a peer at the ISS (Integrated Sensor Suite or thing on the end of the pole on my roof). The rain readings have been looking low for the last couple of months but nothing obviously wrong with the rain bucket. A bit of a wash and brush up has made it a bit more responsive. And the reason for the hot weather? - An hour in my kitchen doing the clean-up. The Pi guru has been asked to edit the Pi weather database
My toaster took a dislike to something and blew a fuse - trouble is my Raspberry Pi is on the same circuit and lost power. Anyone know a good UPS for a Pi?
The highest windspeed measured by the weather station this year has been cited by the local press. It was 39 mph which hit Royston on October 28th at 7:25 am.
Check it out on the Royston Crow website: Storm St Jude sees Royston hit by winds of 39mph.
And on the Weekly News site: St Jude storm update: Travel chaos, fallen trees and serious injuries in Melbourn.
Yours truly was lucky enough to be invited to the first UK meet-up run by Weather Underground last week.
Having been bought by The Weather Channel,, they were eager to meet some weather enthusiasts who contribute readings to their website to hear their views. The meeting in London was the first stop in their trip, followed by Germany where they also have a large number of contributors. They spoke of the mobile apps they are developing and the overhaul of their website
Check out the goodies they gave us.