Kentville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kentville clear sky chart from 2005-11-06 to 2024-01-16.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	19% 11% 5% 8% 6% 3 4 4 5% 6% 29%	75060
	Night	19% 12% 5% 8% 7% 3 4 4 4 6% 27%	74703
Transparency	Day	56% 6% 11% 18% 9% 1	74762
	Night	58% 6% 11% 17% 7% 1	74536
Seeing	Day	26% 17% 30% 19% 7% 1	15982
	Night	26% 17% 29% 21% 6%	23592

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	16% 19% 7% 15% 11% 5% 5% 4 4 3 13%	1399
	11th to 20th	Day	19% 17% 7% 12% 10% 5% 5% 2 3 5% 13%	1554
	21st to end	Day	12% 12% 8% 13% 13% 6% 7% 4 4 5% 17%	1782
February	1st to 10th	Day	17% 13% 7% 14% 12% 5% 5% 4 4 5% 15%	1620
	11th to 20th	Day	17% 16% 5% 13% 10% 5% 4 4 3 4 18%	1573
	21st to end	Day	10% 13% 9% 9% 8% 5% 3 3 4 6% 29%	1349
March	1st to 10th	Day	15% 18% 6% 9% 11% 3 4 3 3 3 24%	1976
	11th to 20th	Day	12% 13% 7% 11% 8% 3 4 4 4 5% 28%	1980
	21st to end	Day	17% 16% 6% 10% 5% 2 3 3 3 4 31%	2178
April	1st to 10th	Day	21% 15% 5% 8% 5% 3 4 4 4 5% 25%	2132
	11th to 20th	Day	20% 13% 2 5% 4 3 3 3 5% 8% 34%	2230
	21st to end	Day	21% 13% 3 7% 5% 3 4 5% 4 7% 28%	2340
May	1st to 10th	Day	24% 12% 3 6% 5% 3 4 5% 5% 6% 26%	2371
	11th to 20th	Day	22% 9% 3 6% 4 3 4 4 4 5% 36%	2478
	21st to end	Day	20% 9% 4 6% 5% 3 5% 4 5% 7% 32%	2724
June	1st to 10th	Day	26% 8% 3 6% 6% 3 4 4 5% 7% 27%	2534
	11th to 20th	Day	23% 8% 3 5% 6% 3 3 5% 6% 7% 32%	2700
	21st to end	Day	23% 10% 4 7% 5% 3 4 4 6% 6% 28%	2700
July	1st to 10th	Day	16% 7% 3 6% 5% 3 4 4 6% 9% 38%	2700
	11th to 20th	Day	15% 7% 3 6% 5% 3 5% 6% 6% 8% 36%	2550
	21st to end	Day	19% 8% 4 6% 6% 3 5% 5% 6% 7% 30%	2643
August	1st to 10th	Day	15% 6% 3 5% 5% 3 5% 6% 6% 8% 38%	2327
	11th to 20th	Day	16% 7% 3 6% 6% 3 5% 5% 6% 7% 35%	2304
	21st to end	Day	15% 6% 3 4 4 3 3 4 5% 7% 46%	2499
September	1st to 10th	Day	17% 6% 2 4 5% 2 4 4 6% 7% 43%	2160
	11th to 20th	Day	18% 8% 2 5% 4 2 4 3 4 5% 45%	2062
	21st to end	Day	18% 7% 2 5% 4 3 4 3 4 7% 43%	1940
October	1st to 10th	Day	18% 8% 2 5% 4 3 4 5% 5% 8% 38%	1800
	11th to 20th	Day	20% 10% 3 5% 5% 3 4 5% 6% 8% 33%	1800
	21st to end	Day	20% 13% 5% 7% 6% 3 4 3 4 6% 29%	1980
November	1st to 10th	Day	21% 14% 4 7% 6% 4 4 4 3 5% 28%	1530
	11th to 20th	Day	17% 18% 7% 9% 6% 3 5% 4 4 5% 23%	1520
	21st to end	Day	19% 17% 6% 10% 7% 3 5% 4 4 4 21%	1520
December	1st to 10th	Day	22% 18% 9% 12% 7% 3 3 4 3 4 15%	1520
	11th to 20th	Day	24% 17% 7% 12% 11% 3 4 3 3 3 13%	1906
	21st to end	Day	21% 16% 11% 13% 9% 3 4 3 4 4 14%	2679
January	1st to 10th	Night	17% 17% 8% 14% 9% 5% 4 4 4 3 14%	2753
	11th to 20th	Night	17% 15% 7% 12% 9% 5% 7% 4 5% 5% 15%	2525
	21st to end	Night	13% 13% 6% 13% 12% 6% 5% 4 5% 6% 18%	2574
February	1st to 10th	Night	18% 14% 5% 13% 12% 5% 5% 4 4 4 16%	2340
	11th to 20th	Night	18% 14% 6% 11% 11% 6% 5% 3 4 4 17%	2273
	21st to end	Night	11% 15% 7% 11% 7% 5% 5% 4 4 5% 26%	1906
March	1st to 10th	Night	15% 17% 5% 9% 9% 4 4 3 4 5% 26%	1971
	11th to 20th	Night	17% 12% 6% 9% 7% 4 6% 5% 4 5% 26%	1979
	21st to end	Night	17% 15% 6% 8% 6% 3 3 3 4 4 31%	2178
April	1st to 10th	Night	22% 14% 5% 7% 6% 3 5% 5% 4 3 27%	1828
	11th to 20th	Night	21% 12% 4 7% 5% 2 4 4 4 6% 32%	1676
	21st to end	Night	23% 12% 3 6% 6% 3 4 4 4 5% 30%	1620
May	1st to 10th	Night	22% 13% 3 6% 5% 3 5% 4 5% 7% 29%	1586
	11th to 20th	Night	23% 9% 3 5% 4 4 5% 4 4 7% 31%	1416
	21st to end	Night	16% 9% 4 8% 5% 2 4 4 6% 8% 33%	1550
June	1st to 10th	Night	26% 6% 3 5% 6% 3 5% 5% 5% 9% 27%	1439
	11th to 20th	Night	22% 8% 3 5% 5% 3 5% 4 4 5% 35%	1260
	21st to end	Night	22% 9% 3 6% 6% 3 5% 6% 4 8% 29%	1260
July	1st to 10th	Night	17% 6% 2 6% 4 3 4 4 7% 10% 36%	1260
	11th to 20th	Night	14% 7% 2 5% 6% 4 6% 6% 7% 9% 34%	1390
	21st to end	Night	15% 8% 3 6% 6% 4 7% 5% 6% 8% 32%	1671
August	1st to 10th	Night	17% 6% 2 4 4 3 4 4 5% 8% 42%	1612
	11th to 20th	Night	15% 9% 3 5% 6% 4 5% 6% 7% 9% 33%	1596
	21st to end	Night	16% 5% 2 5% 4 3 4 4 6% 8% 43%	1855
September	1st to 10th	Night	13% 6% 2 5% 5% 3 4 5% 5% 8% 44%	1800
	11th to 20th	Night	17% 8% 3 4 3 2 4 3 4 8% 43%	1894
	21st to end	Night	17% 6% 3 5% 5% 3 4 4 6% 6% 40%	2018
October	1st to 10th	Night	18% 6% 2 4 5% 3 4 5% 5% 7% 40%	2160
	11th to 20th	Night	18% 8% 2 6% 6% 3 4 5% 5% 7% 35%	2160
	21st to end	Night	25% 12% 4 6% 5% 3 3 4 4 6% 29%	2376
November	1st to 10th	Night	22% 11% 3 7% 6% 3 4 4 4 5% 30%	2545
	11th to 20th	Night	18% 17% 6% 9% 7% 3 5% 4 4 5% 22%	2660
	21st to end	Night	20% 16% 6% 9% 6% 3 4 4 4 5% 23%	2660
December	1st to 10th	Night	22% 17% 7% 12% 8% 3 4 3 4 5% 15%	2660
	11th to 20th	Night	21% 19% 7% 12% 9% 4 3 3 3 4 15%	3293
	21st to end	Night	24% 17% 8% 11% 7% 3 3 3 3 3 20%	4959

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	76% 5% 10% 7% 3	1400
	11th to 20th	Day	76% 6% 8% 9% 2	1554
	21st to end	Day	70% 6% 9% 10% 5%	1782
February	1st to 10th	Day	72% 5% 8% 9% 5% 1	1620
	11th to 20th	Day	72% 6% 9% 9% 5%	1581
	21st to end	Day	56% 5% 11% 17% 9% 1	1349
March	1st to 10th	Day	66% 3 7% 14% 8% 1	1980
	11th to 20th	Day	59% 4 10% 16% 10% 1	1980
	21st to end	Day	59% 4 7% 18% 10% 2	2178
April	1st to 10th	Day	62% 4 7% 14% 11% 2	2132
	11th to 20th	Day	50% 4 9% 21% 14% 1	2230
	21st to end	Day	57% 4 10% 18% 10% 2	2340
May	1st to 10th	Day	58% 5% 9% 17% 10% 1	2371
	11th to 20th	Day	50% 5% 9% 22% 13% 1	2482
	21st to end	Day	52% 6% 11% 21% 9% 1	2724
June	1st to 10th	Day	57% 6% 9% 20% 8%	2534
	11th to 20th	Day	50% 6% 13% 19% 11% 1	2700
	21st to end	Day	56% 7% 10% 16% 10% 1	2700
July	1st to 10th	Day	42% 7% 15% 22% 12% 1	2625
	11th to 20th	Day	43% 8% 15% 23% 10% 1	2472
	21st to end	Day	52% 6% 12% 22% 7% 1	2495
August	1st to 10th	Day	43% 8% 13% 24% 11%	2314
	11th to 20th	Day	45% 9% 13% 24% 9%	2304
	21st to end	Day	38% 5% 14% 29% 13% 1	2499
September	1st to 10th	Day	40% 6% 13% 25% 14% 2	2160
	11th to 20th	Day	43% 4 11% 24% 16% 2	2062
	21st to end	Day	42% 4 9% 28% 16% 1	1940
October	1st to 10th	Day	45% 5% 11% 27% 11% 1	1800
	11th to 20th	Day	50% 6% 13% 23% 7%	1800
	21st to end	Day	58% 4 10% 19% 9%	1980
November	1st to 10th	Day	60% 5% 9% 17% 9% 1	1530
	11th to 20th	Day	63% 5% 14% 13% 4 1	1520
	21st to end	Day	67% 7% 11% 11% 3	1520
December	1st to 10th	Day	74% 5% 8% 9% 3	1520
	11th to 20th	Day	78% 4 7% 8% 3 1	1905
	21st to end	Day	75% 5% 11% 7% 2	2679
January	1st to 10th	Night	74% 6% 9% 9% 2	2753
	11th to 20th	Night	71% 8% 9% 8% 3	2525
	21st to end	Night	67% 6% 11% 13% 3 1	2574
February	1st to 10th	Night	71% 6% 9% 9% 5%	2340
	11th to 20th	Night	70% 6% 9% 10% 4 1	2276
	21st to end	Night	59% 5% 10% 17% 7% 1	1906
March	1st to 10th	Night	62% 6% 8% 15% 9% 1	1980
	11th to 20th	Night	59% 6% 11% 14% 10% 2	1980
	21st to end	Night	57% 4 9% 18% 10% 2	2178
April	1st to 10th	Night	62% 5% 9% 11% 10% 3	1828
	11th to 20th	Night	55% 4 8% 18% 14% 1	1676
	21st to end	Night	56% 7% 10% 15% 12% 1	1620
May	1st to 10th	Night	56% 6% 10% 18% 9% 1	1586
	11th to 20th	Night	53% 5% 9% 23% 10% 1	1417
	21st to end	Night	50% 7% 15% 20% 8% 1	1551
June	1st to 10th	Night	53% 8% 11% 21% 6%	1439
	11th to 20th	Night	51% 5% 11% 21% 10% 1	1260
	21st to end	Night	53% 10% 11% 16% 9% 2	1260
July	1st to 10th	Night	41% 10% 18% 21% 9%	1225
	11th to 20th	Night	44% 9% 18% 20% 9%	1345
	21st to end	Night	48% 9% 15% 20% 8% 1	1579
August	1st to 10th	Night	40% 9% 13% 29% 9%	1600
	11th to 20th	Night	46% 11% 16% 20% 7%	1596
	21st to end	Night	39% 7% 14% 28% 11%	1855
September	1st to 10th	Night	38% 9% 11% 29% 12% 1	1800
	11th to 20th	Night	41% 5% 12% 28% 14% 1	1894
	21st to end	Night	43% 6% 11% 25% 14% 1	2018
October	1st to 10th	Night	43% 6% 12% 25% 14% 1	2160
	11th to 20th	Night	47% 6% 14% 26% 6%	2160
	21st to end	Night	57% 6% 10% 16% 10% 1	2376
November	1st to 10th	Night	55% 7% 12% 18% 9% 1	2545
	11th to 20th	Night	64% 6% 11% 13% 6%	2660
	21st to end	Night	65% 5% 14% 12% 3	2660
December	1st to 10th	Night	72% 6% 9% 11% 3	2660
	11th to 20th	Night	75% 5% 6% 9% 4	3295
	21st to end	Night	70% 6% 8% 13% 3	4959

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	29% 26% 32% 11% 2	252
	11th to 20th	Day	30% 26% 30% 9% 3	356
	21st to end	Day	22% 25% 35% 16% 2 1	374
February	1st to 10th	Day	29% 24% 34% 11% 2	340
	11th to 20th	Day	33% 30% 23% 13% 1	336
	21st to end	Day	22% 22% 40% 14% 3	288
March	1st to 10th	Day	26% 25% 34% 11% 3	420
	11th to 20th	Day	26% 24% 35% 12% 4	420
	21st to end	Day	31% 23% 28% 13% 5%	462
April	1st to 10th	Day	38% 22% 26% 11% 1	420
	11th to 20th	Day	24% 26% 32% 14% 4	412
	21st to end	Day	28% 17% 30% 15% 10% 1	420
May	1st to 10th	Day	33% 21% 25% 15% 4 1	454
	11th to 20th	Day	26% 18% 25% 23% 7% 1	624
	21st to end	Day	27% 14% 34% 19% 6% 1	680
June	1st to 10th	Day	31% 12% 26% 22% 7% 1	630
	11th to 20th	Day	27% 12% 30% 23% 7% 1	630
	21st to end	Day	26% 9% 28% 25% 10% 2	630
July	1st to 10th	Day	19% 6% 35% 27% 12% 1	620
	11th to 20th	Day	20% 5% 32% 26% 15% 1	618
	21st to end	Day	23% 7% 29% 29% 12% 1	583
August	1st to 10th	Day	13% 6% 33% 33% 12% 2	446
	11th to 20th	Day	20% 8% 31% 25% 13% 4	439
	21st to end	Day	17% 11% 28% 26% 14% 3	495
September	1st to 10th	Day	20% 8% 33% 26% 11% 2	450
	11th to 20th	Day	23% 14% 26% 24% 11% 2	450
	21st to end	Day	22% 13% 30% 21% 11% 3	430
October	1st to 10th	Day	24% 13% 29% 22% 9% 3	360
	11th to 20th	Day	26% 20% 25% 20% 8% 2	360
	21st to end	Day	27% 21% 27% 19% 5% 1	396
November	1st to 10th	Day	31% 16% 30% 18% 3 1	365
	11th to 20th	Day	35% 22% 24% 14% 6%	370
	21st to end	Day	31% 22% 32% 11% 2 1	370
December	1st to 10th	Day	35% 23% 27% 12% 3	370
	11th to 20th	Day	38% 28% 24% 9% 1	370
	21st to end	Day	35% 23% 30% 9% 3 1	342
January	1st to 10th	Night	30% 23% 31% 14% 2	850
	11th to 20th	Night	29% 23% 29% 15% 3	795
	21st to end	Night	24% 25% 33% 14% 4	792
February	1st to 10th	Night	31% 25% 28% 14% 2	720
	11th to 20th	Night	32% 25% 29% 11% 2	703
	21st to end	Night	24% 22% 32% 18% 4	592
March	1st to 10th	Night	27% 22% 32% 16% 3	720
	11th to 20th	Night	24% 20% 31% 21% 5%	720
	21st to end	Night	27% 18% 32% 16% 6%	792
April	1st to 10th	Night	32% 18% 32% 16% 3	568
	11th to 20th	Night	28% 18% 33% 16% 5%	534
	21st to end	Night	29% 16% 30% 18% 5% 1	540
May	1st to 10th	Night	30% 12% 29% 21% 6% 1	540
	11th to 20th	Night	27% 11% 29% 27% 6%	532
	21st to end	Night	21% 11% 37% 26% 5% 1	583
June	1st to 10th	Night	28% 11% 30% 25% 6%	539
	11th to 20th	Night	25% 8% 26% 34% 6% 1	360
	21st to end	Night	24% 8% 27% 30% 9% 1	360
July	1st to 10th	Night	19% 5% 30% 37% 9%	350
	11th to 20th	Night	17% 6% 27% 37% 12%	475
	21st to end	Night	19% 5% 26% 41% 9% 1	590
August	1st to 10th	Night	17% 4 25% 40% 12% 1	538
	11th to 20th	Night	18% 7% 26% 32% 17% 1	532
	21st to end	Night	18% 7% 25% 33% 16% 1	594
September	1st to 10th	Night	16% 8% 30% 34% 12% 1	540
	11th to 20th	Night	20% 10% 26% 31% 12% 1	634
	21st to end	Night	21% 10% 31% 27% 9% 2	720
October	1st to 10th	Night	20% 13% 31% 25% 10% 1	720
	11th to 20th	Night	24% 15% 33% 20% 8% 1	720
	21st to end	Night	34% 19% 23% 19% 5%	792
November	1st to 10th	Night	29% 18% 28% 19% 5%	812
	11th to 20th	Night	31% 22% 26% 17% 4	850
	21st to end	Night	32% 20% 29% 17% 2	850
December	1st to 10th	Night	34% 22% 27% 14% 2	850
	11th to 20th	Night	34% 25% 27% 11% 3	850
	21st to end	Night	32% 23% 27% 15% 3	935

Page generated at 2024-01-13 10:37:51. Version ac07

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