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 2026-04-02.

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	18% 13% 4 10% 6% 5% 4 3 5% 6% 27%	132182
	Night	17% 14% 5% 11% 7% 5% 4 3 4 5% 25%	129713
Transparency	Day	57% 5% 11% 18% 9% 1	135761
	Night	59% 6% 11% 16% 7% 1	134221
Seeing	Day	27% 17% 30% 19% 7% 1	18997
	Night	27% 17% 29% 21% 6%	26569

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	13% 23% 7% 18% 9% 7% 3 2 3 3 13%	4329
	11th to 20th	Day	15% 21% 11% 23% 6% 4 3 2 3 3 8%	4921
	21st to end	Day	12% 13% 6% 15% 12% 9% 6% 3 4 5% 15%	5781
February	1st to 10th	Day	16% 15% 6% 16% 11% 6% 4 3 4 5% 15%	1890
	11th to 20th	Day	16% 16% 5% 15% 9% 6% 3 3 3 3 20%	1843
	21st to end	Day	11% 15% 7% 11% 8% 6% 3 2 4 6% 28%	1577
March	1st to 10th	Day	21% 17% 4 14% 7% 6% 3 2 3 4 19%	5040
	11th to 20th	Day	13% 16% 6% 10% 6% 4 4 3 4 6% 27%	5090
	21st to end	Day	21% 20% 5% 11% 5% 4 4 3 3 4 20%	5587
April	1st to 10th	Day	22% 16% 4 9% 4 4 3 3 4 5% 25%	2381
	11th to 20th	Day	19% 14% 3 6% 4 4 4 2 5% 7% 33%	2482
	21st to end	Day	21% 12% 3 8% 5% 3 4 4 5% 6% 30%	2600
May	1st to 10th	Day	27% 16% 3 7% 4 4 5% 4 5% 6% 20%	5973
	11th to 20th	Day	21% 12% 3 8% 5% 5% 4 3 4 6% 31%	6318
	21st to end	Day	17% 12% 3 7% 5% 4 4 3 6% 8% 32%	6948
June	1st to 10th	Day	24% 9% 3 7% 6% 4 5% 4 5% 7% 26%	2816
	11th to 20th	Day	21% 9% 2 6% 5% 4 4 4 6% 7% 33%	3000
	21st to end	Day	24% 11% 4 7% 4 4 4 3 6% 6% 27%	3000
July	1st to 10th	Day	20% 9% 3 7% 5% 4 4 4 6% 9% 29%	6820
	11th to 20th	Day	15% 8% 3 7% 4 4 4 4 6% 8% 37%	6418
	21st to end	Day	12% 7% 3 7% 5% 5% 5% 4 7% 9% 37%	6660
August	1st to 10th	Day	19% 10% 3 7% 5% 5% 5% 4 5% 6% 30%	4235
	11th to 20th	Day	13% 6% 3 7% 5% 6% 5% 5% 6% 7% 37%	4175
	21st to end	Day	12% 5% 2 5% 4 4 4 4 6% 8% 47%	4526
September	1st to 10th	Day	17% 7% 2 5% 4 3 3 3 6% 7% 43%	2400
	11th to 20th	Day	17% 7% 2 6% 3 3 4 3 4 6% 46%	2290
	21st to end	Day	17% 7% 2 6% 4 4 4 2 4 8% 43%	2155
October	1st to 10th	Day	17% 7% 2 6% 4 4 4 4 5% 8% 39%	2000
	11th to 20th	Day	19% 11% 3 7% 4 3 5% 4 6% 7% 33%	2000
	21st to end	Day	18% 14% 4 8% 5% 4 4 2 4 6% 30%	2200
November	1st to 10th	Day	20% 16% 4 9% 5% 5% 3 3 4 5% 28%	1694
	11th to 20th	Day	18% 21% 7% 9% 5% 4 3 3 5% 4 22%	1680
	21st to end	Day	19% 19% 6% 11% 6% 5% 4 4 4 4 19%	1680
December	1st to 10th	Day	17% 17% 10% 20% 6% 4 3 3 3 5% 13%	2690
	11th to 20th	Day	21% 17% 6% 16% 8% 4 3 2 3 3 17%	3076
	21st to end	Day	18% 16% 9% 16% 8% 4 3 3 3 4 16%	3907
January	1st to 10th	Night	13% 18% 8% 21% 10% 6% 3 2 3 3 12%	8554
	11th to 20th	Night	17% 19% 8% 21% 6% 5% 3 2 3 3 12%	7978
	21st to end	Night	10% 12% 5% 19% 17% 9% 5% 3 4 5% 12%	8400
February	1st to 10th	Night	17% 16% 5% 16% 10% 6% 3 3 4 4 16%	2730
	11th to 20th	Night	16% 14% 6% 12% 10% 7% 4 3 4 4 19%	2663
	21st to end	Night	11% 16% 5% 11% 7% 5% 5% 3 4 4 27%	2227
March	1st to 10th	Night	20% 16% 5% 14% 10% 5% 3 2 3 4 19%	5020
	11th to 20th	Night	17% 17% 6% 8% 4 4 4 3 4 5% 27%	5089
	21st to end	Night	23% 16% 6% 10% 5% 4 3 2 3 4 24%	5587
April	1st to 10th	Night	22% 16% 4 7% 5% 4 4 3 4 3 27%	2042
	11th to 20th	Night	21% 13% 3 8% 4 3 4 3 4 6% 31%	1864
	21st to end	Night	22% 13% 3 7% 5% 4 3 3 5% 5% 30%	1800
May	1st to 10th	Night	24% 17% 3 7% 5% 5% 4 3 4 5% 23%	3968
	11th to 20th	Night	21% 12% 3 7% 4 4 5% 4 5% 7% 30%	3596
	21st to end	Night	16% 13% 3 7% 4 4 4 3 5% 7% 33%	3948
June	1st to 10th	Night	25% 8% 2 6% 5% 4 4 4 6% 9% 27%	1598
	11th to 20th	Night	20% 9% 3 6% 5% 4 5% 3 5% 6% 36%	1400
	21st to end	Night	22% 10% 3 6% 5% 4 4 5% 5% 7% 29%	1400
July	1st to 10th	Night	17% 11% 4 9% 5% 5% 4 4 6% 8% 27%	3160
	11th to 20th	Night	14% 7% 2 5% 5% 5% 5% 5% 6% 9% 37%	3500
	21st to end	Night	14% 6% 2 6% 4 4 4 4 6% 9% 40%	4199
August	1st to 10th	Night	20% 10% 3 6% 4 3 4 3 5% 7% 34%	2915
	11th to 20th	Night	12% 8% 3 7% 4 5% 5% 4 6% 9% 37%	2872
	21st to end	Night	14% 4 2 5% 3 4 4 3 6% 8% 48%	3370
September	1st to 10th	Night	13% 7% 2 5% 4 4 4 4 5% 7% 46%	2000
	11th to 20th	Night	16% 8% 3 5% 3 3 3 3 5% 7% 44%	2106
	21st to end	Night	17% 7% 2 6% 4 4 5% 3 6% 6% 39%	2243
October	1st to 10th	Night	18% 7% 2 5% 4 4 4 4 5% 7% 41%	2400
	11th to 20th	Night	18% 9% 2 7% 5% 4 4 4 5% 7% 35%	2400
	21st to end	Night	24% 12% 3 6% 4 3 3 3 4 6% 30%	2640
November	1st to 10th	Night	21% 13% 3 7% 5% 4 4 3 4 5% 30%	2821
	11th to 20th	Night	18% 20% 5% 10% 6% 4 4 3 4 4 21%	2940
	21st to end	Night	20% 18% 6% 10% 5% 4 4 3 4 5% 22%	2940
December	1st to 10th	Night	14% 16% 9% 19% 7% 5% 4 3 4 5% 15%	4720
	11th to 20th	Night	16% 17% 6% 15% 7% 5% 3 3 3 5% 20%	5353
	21st to end	Night	21% 17% 6% 13% 7% 3 3 2 3 4 21%	7270

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	77% 4 11% 7% 2	4330
	11th to 20th	Day	82% 4 7% 6% 1	4952
	21st to end	Day	70% 6% 8% 8% 7% 1	5781
February	1st to 10th	Day	72% 5% 8% 9% 6% 1	1890
	11th to 20th	Day	70% 5% 9% 11% 5%	1851
	21st to end	Day	57% 5% 11% 16% 9% 1	1577
March	1st to 10th	Day	70% 3 7% 12% 7% 1	5044
	11th to 20th	Day	56% 6% 14% 17% 7% 1	5090
	21st to end	Day	70% 2 5% 14% 8% 1	5587
April	1st to 10th	Day	62% 4 7% 13% 11% 3	2381
	11th to 20th	Day	51% 4 9% 22% 13% 1	2482
	21st to end	Day	54% 4 10% 18% 11% 3	2600
May	1st to 10th	Day	64% 7% 9% 14% 7% 1	5984
	11th to 20th	Day	54% 6% 12% 21% 6% 1	6322
	21st to end	Day	50% 7% 13% 19% 11%	6948
June	1st to 10th	Day	56% 6% 10% 19% 8% 1	2816
	11th to 20th	Day	48% 6% 13% 20% 11% 1	3000
	21st to end	Day	57% 7% 9% 16% 10% 1	3000
July	1st to 10th	Day	51% 6% 14% 18% 10% 1	6745
	11th to 20th	Day	44% 6% 14% 25% 10%	6340
	21st to end	Day	42% 7% 16% 26% 9%	6470
August	1st to 10th	Day	54% 6% 10% 20% 10%	4222
	11th to 20th	Day	43% 8% 13% 24% 11%	4214
	21st to end	Day	34% 6% 13% 29% 17% 1	4526
September	1st to 10th	Day	40% 5% 12% 26% 14% 2	2400
	11th to 20th	Day	42% 4 12% 25% 16% 1	2290
	21st to end	Day	41% 5% 9% 27% 17% 1	2155
October	1st to 10th	Day	44% 5% 12% 26% 12%	3260
	11th to 20th	Day	46% 5% 9% 27% 13%	3240
	21st to end	Day	47% 4 14% 22% 13%	3538
November	1st to 10th	Day	60% 5% 10% 17% 8% 1	1694
	11th to 20th	Day	66% 4 13% 13% 4	1680
	21st to end	Day	68% 7% 11% 11% 3	1680
December	1st to 10th	Day	75% 5% 6% 12% 2	2690
	11th to 20th	Day	74% 4 6% 11% 4 1	3075
	21st to end	Day	72% 5% 9% 9% 4	3907
January	1st to 10th	Night	76% 5% 10% 8% 1	8554
	11th to 20th	Night	76% 5% 8% 8% 3	8022
	21st to end	Night	72% 6% 8% 9% 4 1	8400
February	1st to 10th	Night	72% 5% 8% 9% 6% 1	2730
	11th to 20th	Night	67% 5% 10% 13% 5% 1	2666
	21st to end	Night	58% 5% 10% 18% 8% 1	2227
March	1st to 10th	Night	71% 4 5% 11% 9% 1	5029
	11th to 20th	Night	58% 5% 15% 15% 6% 1	5090
	21st to end	Night	66% 3 6% 15% 9% 1	5587
April	1st to 10th	Night	61% 4 8% 12% 12% 3	2042
	11th to 20th	Night	54% 4 8% 19% 13% 1	1864
	21st to end	Night	55% 6% 9% 15% 12% 2	1800
May	1st to 10th	Night	64% 6% 10% 13% 7%	3974
	11th to 20th	Night	53% 7% 11% 21% 6% 2	3597
	21st to end	Night	51% 7% 16% 19% 7% 1	3949
June	1st to 10th	Night	53% 8% 11% 21% 6% 1	1598
	11th to 20th	Night	49% 5% 12% 23% 10% 1	1400
	21st to end	Night	54% 9% 12% 16% 9% 2	1400
July	1st to 10th	Night	54% 7% 13% 17% 8%	3125
	11th to 20th	Night	41% 8% 18% 21% 11% 1	3455
	21st to end	Night	39% 7% 16% 24% 12%	4075
August	1st to 10th	Night	50% 7% 13% 23% 7%	2903
	11th to 20th	Night	42% 9% 16% 23% 9%	2899
	21st to end	Night	34% 6% 15% 27% 16%	3369
September	1st to 10th	Night	37% 8% 11% 29% 14% 1	2000
	11th to 20th	Night	40% 4 11% 29% 14% 1	2106
	21st to end	Night	44% 6% 10% 25% 14% 1	2243
October	1st to 10th	Night	47% 4 12% 25% 12%	3920
	11th to 20th	Night	42% 5% 13% 26% 14%	3899
	21st to end	Night	47% 4 12% 23% 14%	4252
November	1st to 10th	Night	55% 6% 12% 17% 8% 1	2821
	11th to 20th	Night	66% 6% 10% 13% 5%	2940
	21st to end	Night	65% 5% 13% 12% 3	2940
December	1st to 10th	Night	70% 6% 8% 13% 2	4720
	11th to 20th	Night	67% 5% 8% 14% 5%	5355
	21st to end	Night	68% 5% 8% 14% 5%	7270

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	31% 26% 30% 10% 2	300
	11th to 20th	Day	33% 24% 28% 10% 4	430
	21st to end	Day	24% 25% 35% 14% 2	473
February	1st to 10th	Day	29% 23% 30% 13% 4	430
	11th to 20th	Day	31% 30% 24% 13% 1	426
	21st to end	Day	25% 21% 37% 14% 2	366
March	1st to 10th	Day	30% 24% 33% 10% 3	540
	11th to 20th	Day	28% 25% 32% 12% 4	540
	21st to end	Day	34% 24% 27% 11% 4	594
April	1st to 10th	Day	40% 22% 26% 10% 2	504
	11th to 20th	Day	27% 24% 32% 12% 4	492
	21st to end	Day	27% 20% 29% 14% 9% 1	500
May	1st to 10th	Day	34% 19% 26% 16% 4 1	538
	11th to 20th	Day	25% 17% 25% 23% 8% 1	724
	21st to end	Day	27% 14% 34% 19% 6% 1	790
June	1st to 10th	Day	30% 13% 26% 23% 7% 1	730
	11th to 20th	Day	25% 13% 32% 23% 7% 1	730
	21st to end	Day	29% 10% 27% 24% 8% 2	730
July	1st to 10th	Day	20% 7% 36% 25% 11% 1	720
	11th to 20th	Day	20% 6% 32% 26% 14% 1	718
	21st to end	Day	22% 7% 32% 28% 11% 1	681
August	1st to 10th	Day	14% 7% 33% 33% 11% 2	526
	11th to 20th	Day	18% 8% 30% 27% 13% 4	519
	21st to end	Day	17% 12% 31% 24% 13% 4	583
September	1st to 10th	Day	20% 10% 32% 25% 11% 2	530
	11th to 20th	Day	22% 13% 27% 24% 11% 2	530
	21st to end	Day	20% 14% 30% 22% 10% 3	505
October	1st to 10th	Day	23% 13% 29% 24% 9% 3	420
	11th to 20th	Day	26% 19% 27% 19% 7% 1	420
	21st to end	Day	26% 21% 27% 18% 5% 1	462
November	1st to 10th	Day	34% 17% 29% 17% 3 1	425
	11th to 20th	Day	37% 22% 24% 12% 5%	430
	21st to end	Day	33% 23% 31% 11% 3 1	430
December	1st to 10th	Day	34% 24% 26% 13% 3	430
	11th to 20th	Day	39% 28% 23% 8% 2	430
	21st to end	Day	34% 24% 30% 9% 2 1	401
January	1st to 10th	Night	30% 24% 30% 14% 2	950
	11th to 20th	Night	30% 22% 29% 15% 4	903
	21st to end	Night	24% 25% 33% 14% 3	924
February	1st to 10th	Night	30% 23% 29% 15% 3	840
	11th to 20th	Night	31% 25% 28% 13% 2	823
	21st to end	Night	24% 21% 33% 18% 4	692
March	1st to 10th	Night	28% 23% 31% 15% 3	840
	11th to 20th	Night	25% 19% 30% 21% 4	840
	21st to end	Night	29% 19% 32% 15% 5%	924
April	1st to 10th	Night	34% 18% 30% 15% 3	635
	11th to 20th	Night	28% 18% 33% 16% 5%	594
	21st to end	Night	29% 16% 31% 19% 5% 1	600
May	1st to 10th	Night	31% 13% 28% 21% 6% 1	600
	11th to 20th	Night	26% 12% 27% 27% 7%	592
	21st to end	Night	21% 11% 35% 26% 5%	649
June	1st to 10th	Night	28% 11% 28% 27% 6%	598
	11th to 20th	Night	23% 8% 27% 36% 6% 1	400
	21st to end	Night	25% 8% 27% 30% 9% 1	400
July	1st to 10th	Night	19% 6% 29% 37% 9%	390
	11th to 20th	Night	16% 7% 27% 37% 12% 1	530
	21st to end	Night	18% 5% 27% 40% 9%	656
August	1st to 10th	Night	18% 4 26% 40% 12% 1	598
	11th to 20th	Night	17% 7% 26% 32% 18% 1	592
	21st to end	Night	17% 7% 26% 34% 15% 1	660
September	1st to 10th	Night	16% 8% 31% 32% 13% 1	600
	11th to 20th	Night	19% 10% 26% 31% 12% 1	706
	21st to end	Night	21% 10% 30% 28% 9% 1	800
October	1st to 10th	Night	20% 13% 31% 26% 9% 1	800
	11th to 20th	Night	25% 15% 31% 20% 8% 1	800
	21st to end	Night	33% 19% 23% 19% 4	880
November	1st to 10th	Night	30% 19% 27% 18% 5%	908
	11th to 20th	Night	33% 21% 25% 16% 4	950
	21st to end	Night	33% 20% 29% 16% 3	950
December	1st to 10th	Night	33% 21% 27% 15% 3	950
	11th to 20th	Night	35% 25% 27% 11% 2	950
	21st to end	Night	31% 23% 27% 15% 3	1045

Page generated at 2026-03-30 03:18:46. Version ac07

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