National Weather Service United States Department of Commerce

2017 Climate for Rochester

  Temperatures Precipitation
Month High Low Average Departure Total Departure Snow
January 24.6 12.5 18.6 +2.8 2.12 +1.26 13.2
February 36.2 19.0 27.6 +7.3 1.66 +0.83 10.4
March 38.3 24.1 31.2 -1.2 2.87 +0.99 8.4
April 56.7 39.4 48.1 +1.4 4.55 +1.31 T
May 66.1 46.4 56.2 -1.9 3.07 -0.56 0.0
June 79.9 57.3 68.6 +1.0 3.71 -0.97 ...
July 80.7 61.0 70.9 -0.5 2.35 -2.20 ...
August 74.1 55.4 64.8 -4.3 4.17 -0.35 ...
September 75.5 52.7 64.1 +3.2 2.17 -1.28 ...
October 58.2 41.1 49.6 +1.2 5.09 +2.85 2.6
November 42.0 23.8 32.9 -0.9 0.42 -1.49 0.7
December 25.5 10.3 17.9 -1.8 0.51 -0.72 7.2
TOTALS: 54.8 36.9 45.9 +0.5 32.69 -0.33 ***
*** Seasonal snowfall is recorded from July-June (overlapping years), not yearly. ***

Records

Temperature...

Highs:

  • 96 on June 11th
  • 89 on September 24th
  • 61 on November 24th 

Lows:

  • None

Highest Lows:

  • 33 on December 21st, tied with previous years
  • 34 on February 11th
  • 41 on February 20th
  • 51 on April 9th, tied with previous years
  • 69 on June 10th, tied with previous years
  • 71 on September 22nd
  • 68 on September 23rd 

Lowest Highs:

  • None

Monthly:

  • 8th warmest February at 27.6 degrees

Seasonal:

  • None

Yearly:

  • None

Precipitation...

One-day pcpn:

  • 0.45” on January 25th
  • 0.92” on March 6th
  • 1.41” on June 12th  

One-day snowfall:

  • 6.0” on January 25th
  • 6.4” on February 24th 

Monthly pcpn:

  • 4th wettest January with 2.12 inches
  • 4th wettest October with 5.09 inches

Monthly snowfall:

  • 6th snowiest October with 2.6 inches, tied with previous years

Seasonal precipitation:

  • All time wettest winter (Dec 2016-Feb 2017) at 5.85 inches

Yearly precipitation:

  • None

Mild air greeted Rochester for the first few days of the new year, with a quick dip into the single digits above and below zero for the 4th through the 7th.  It stayed on the cool-side through mid month, but after the 15th it would warm and stay unseasonably mild for the rest of the month – finishing almost 3 degrees above normal. Of note, low temperatures from the 17th through the 25th were warmer than the average highs! It was also a wet month with the 2.12 inch total coming in as the 4th wettest on record for Rochester. There were 7 days with 1/10 of an inch or more of precipitation - tying for the most in a January and well above the normal of 3. Thanks to the mild conditions, some of that came as rain, but January also managed to drop some snow – 13.2”, about an inch above normal.

RST Jan Temp 2017
   

The relatively mild winter conditions persisted for February, finishing over 7 degrees above its normal and making it the 8th warmest on record (27.6 degrees). Temperatures exceeded 50 degrees 5 times, second most for a February. In addition, there were no below zero temperatures – a rare occurrence for February, which is accustom to around 8 such days.  While total precipitation for the month was almost an inch above normal, the start was rather dry. From the 1st through the 19th only 0.05 inches fell. After that, 3 days would account for 96% of February’s total.  Rain brought 0.81” on the 20th, with a snow storm on the 23rd-24th dropping 10.2 inches on Rochester (8/10ths liquid equivalent). In addition, there were only 2 other days with measurable snowfall in February, with a mere 1/10 falling on both the 1st and 4th.   

The winter months of December through February recorded 5.85 inches liquid equivalent precipitation, making it the wettest winter on record for Rochester. Meanwhile, the average temperature of 21.5 degrees marked it as the 15th warmest winter on record.

RST Feb Temp 2017
   

The mild start to the year would end in March as temperatures averaged a degree below normal. However, the stretch of days from the 10th through the 15th were responsible for much of the month’s cooling. Temperatures never warmed above 30 during this period with single digit lows on 3 days. Outside of this stretch, temperatures mostly hovered around normal. Precipitation was an inch above normal. While there were 10 days with measurable precipitation, 4 days accounted for 85% of total. The last measurable snow for the 2016-17 snowfall season fell on 13th – a few weeks before the average of April 10th – and 6th earliest last occurrence of measurable snow in Rochester.

RST Mar Temp 2017
   

April experienced the usual swings in temperature that are typical for this spring month with highs in the 60s one day, dropping into the 40s two days later. On the whole, April finished around 1 ½ degrees above normal. The first 70 degree day for 2017 occurred on the 8th (70) which is close to the average (the 12th). The last freezing day for the winter season came on the morning of the 28th, about a week earlier than average. It was a wet month with 16 days of measurable precipitation (tied for 4th most in an April), 6 of those recording more than 1/4 of an inch. The monthly total of 4.55 inches made it the 13th wettest April on record. The last few flurries for the winter season came on 27th

January through April made for a very soggy start of 2017 – with the 11.20 inches during that span finishing as the 3rd wettest 4 month start to a year for Rochester.

RST Apr Temp 2017
   

Temperatures ran the gamut in May with a high as low as 42 on the 1st, to as warm as 87 on the 16th. On the whole, temperatures finished nearly 2 degrees below the monthly normal. Precipitation also fell short of the monthly normal by about ½ inch. The bulk of the rain came over a 9 day stretch (15th – 23rd) with 8 of those days recording measurable precipitation. That stretch accounted for nearly 90% of May’s total. The peak wind gust for 2017 came in May with 66 mph recorded on the 17th

RST May Temp 2017
   

Summer roared in with the flip of the calendar to June. Highs were in the 80s on 14 of the first   17 days, reaching 90 degrees or greater 3 times. It was the warmest start to a June, averaging over 72.5 degrees through the 17th.  After the hot start, the month would finish on a relatively cool note. Temperatures were below normal for the rest of the month with highs only in the 60s for the 24th through 26th. June started off relatively dry with under 1/10 of an inch of rain falling from the 1st through the 11th. Rain was a bit more prevalent for the rest of the month, with 10 days of measurable rain through the 30th, 5 of those recording around ¼” or greater. Still, June would finish around 1 inch below its normal.

RST Jun Temp 2017
   
July was right around its normal for temperatures, without any drastic swings from warm to cold (or vice versa). It was a dry month though – measurable rain only fell on 7 days (average is 10) while the monthly total was over 2 inches below a normal July. Most of what did fall came over a 5 day span – the 18th through 21st accounted for nearly 80% of the month’s total.
RST Jul Temp 2017
   

August would round out the traditional summer months on a very cool note. Temperatures were at or below normal on 26 of the 31 days with highs only in the 60s on 3 days. Highs reached 80 or greater on just 3 days, well below the average of 16 such days and the least amount in any August for Rochester. The 64.8 degree average temperature made it the 6th coldest August on record. Rainfall was closer to normal in August – but much of what fell came in only a few days. Heavy rains on the 2nd and 16th brought over 3 inches to Rochester, nearly 75% of what would fall in August. In addition, the month ended dry, recording less than 1/10 of an inch from the 22nd through the 31st.

RST Aug Temp 2017
   

September got the traditional fall months off to a very mild start – averaging 3 degrees above its normal and finishing as the 10th warmest September on record (64.1 F). Highs reached or exceeded 80 degrees on 10 days – well above its average of 6. The last 90 degree day of 2017 also occurred this month (91 on the 22nd), over a month later than the average last occurrence (August 16th). The dry end to August persisted through the start of September. Around ¼” fell through the 15th, most of which came on the 4th. Nary a raindrop was felt from the 6th through the 14th. The end of the month helped make up some of the early deficit with 4 days of over ¼ of an inch. Still, the September finished around 1 ¼ inches below its normal.

RST Sep Temp 2017
   

October stayed mild but was soggy. There were 13 days with measurable precipitation – tied for 8th most on record for October and well above its average of 8. Out of those days, 6 of them recorded ¼” or more (4th most for an October) with an inch or greater failing on 2 of those days.The 5.09” total made it the 4th wettest October on record. While mostly at or above the normal for the better part of the month, October would end on a chilly note. From the 27th through 31st highs were only in the 30s and 40s with the lows all below freezing. The first snowfall came in the form of 2.6 inches on the 27th – one of the snowiest starts to a snowfall season (most was 5 inch snowfalls on 11/8/85 and 10/22/79).

RST Oct Temp 2017
   

While November temperatures finished a bit below normal, it was a tale of two halves. The start of the month was cool with average temperatures below normal on 13 out of the first 15 days. For the end of the month, it was above normal on 10 of the remaining 15. Highs even reached 61 on the 24th, the last time 2017 would see a 60 degree temperature and about 2 weeks later than the average last occurrence. It was a very dry November, with less than ½ inch falling for the entire month despite accumulating precipitation on 8 days. The second half of the month was especially dry as just 0.01” fell from the 18th through the 30th. Snowfall was also sparse, with the entire month’s total of only 0.7 inches falling on the 1st.

RST Nov Temp 2017
   

December’s average temperature finished almost 2 degrees below normal, but that doesn’t tell the whole story. The month started out very mild, with above normal temperatures on 16 of the first 21 days. It even reached 64 on the 4th, the last 60 degree day for 2017 and the 5th latest occurrence of a 60 degree on record for Rochester. The end of the month would take a turn toward the frigid with highs not warming above zero on 3 out of the last 6 days, with lows well into the teens below zero on 4 of those. December was a dry month, about 3/4rds of an inch below normal. There was measurable precipitation on 9 days (1 more than the December average), but 7 of those recorded less than 1/10”. Snow was also lacking with just over 7 inches falling for the month (normal is 12 ½). There were 11 days of measurable snow, but less than ½ inch fell on 7 of those. There was an additional 5 day with flurries.  So, Rochester saw at least a little snow on most days during the month, but it didn’t amount to much.  

RST Dec Temp 2017
   

2017 will go down as a warm one for Rochester, with precipitation right around normal.

A mild winter and warm fall accounted for much of the warmth. The average temperature of 45.9 degrees tied it with 1990 as the 13th warmest on record. Temperatures held above freezing on 225 days, 6th most in any year in Rochester. Also, there were only 17 days where temperatures chilled to zero of colder, tied for 9th least on record.

There were 32.69 inches of precipitation in 2017. There were 127 days with measurable precipitation, 42 of which dropped ¼” or greater.

RST Annual Temp and Precipitation 2017

 


Highest temperature for 2017 96 on June 11th  
Lowest temperature for 2017 -17 on December 31st 
Highest one-day precipitation 2.01 inches on August 3rd   
Highest one-day snowfall 6.4 inches on February 24th and March 12th 
Number of days with highs at or above 90 degrees 5
Number of days with highs at or below 32 degrees 67
Number of days with zero or below temperatures 17
Peak wind gust 66 mph from the S on May 17th 
Number of days with measurable precipitation 127
Percentage of days with measurable precipitation 35%
Number of days with above normal temperatures 174
Percentage of days with above normal temperatures 48%