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 2024-12-09.

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% 12% 4 9% 5% 4 4 3 5% 6% 28%	102278
	Night	18% 13% 4 10% 6% 4 4 3 5% 6% 27%	97538
Transparency	Day	55% 6% 11% 18% 9% 1	105871
	Night	57% 6% 11% 17% 8% 1	102034
Seeing	Day	26% 17% 30% 19% 7% 1	17255
	Night	26% 17% 29% 22% 6%	24741

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	15% 20% 6% 15% 7% 6% 3 3 3 4 20%	2331
	11th to 20th	Day	14% 16% 7% 23% 8% 5% 4 2 4 4 13%	2655
	21st to end	Day	16% 15% 8% 14% 8% 6% 4 2 4 5% 18%	3124
February	1st to 10th	Day	17% 15% 6% 14% 11% 6% 4 3 4 5% 15%	1710
	11th to 20th	Day	16% 17% 5% 14% 10% 6% 4 3 3 3 18%	1663
	21st to end	Day	11% 15% 7% 10% 8% 6% 3 2 4 6% 29%	1431
March	1st to 10th	Day	23% 18% 4 9% 7% 5% 3 2 4 4 21%	3430
	11th to 20th	Day	12% 22% 6% 11% 6% 5% 4 3 3 5% 22%	3480
	21st to end	Day	24% 19% 5% 12% 4 4 4 2 3 3 21%	3816
April	1st to 10th	Day	21% 17% 4 9% 4 4 3 3 4 5% 26%	2251
	11th to 20th	Day	19% 14% 3 6% 4 3 3 2 5% 7% 34%	2356
	21st to end	Day	20% 13% 3 8% 5% 3 4 4 5% 6% 30%	2470
May	1st to 10th	Day	25% 18% 3 6% 4 3 4 4 5% 7% 22%	4165
	11th to 20th	Day	20% 10% 3 7% 5% 4 4 3 5% 6% 33%	4398
	21st to end	Day	15% 9% 3 7% 5% 5% 4 4 7% 9% 33%	4836
June	1st to 10th	Day	25% 9% 3 7% 6% 4 4 4 5% 7% 26%	2675
	11th to 20th	Day	22% 9% 2 5% 5% 4 4 4 6% 7% 32%	2850
	21st to end	Day	24% 11% 4 7% 4 4 4 3 6% 6% 27%	2850
July	1st to 10th	Day	20% 8% 3 7% 5% 4 4 3 6% 8% 32%	4760
	11th to 20th	Day	17% 7% 3 7% 4 5% 5% 4 6% 8% 34%	4484
	21st to end	Day	14% 8% 3 7% 6% 5% 5% 4 7% 9% 32%	4632
August	1st to 10th	Day	20% 10% 3 8% 5% 5% 5% 4 5% 6% 29%	4105
	11th to 20th	Day	14% 7% 3 8% 5% 6% 5% 4 6% 7% 36%	4045
	21st to end	Day	12% 5% 2 5% 4 4 4 4 6% 9% 46%	4387
September	1st to 10th	Day	17% 6% 2 5% 4 3 3 3 5% 6% 43%	2280
	11th to 20th	Day	18% 7% 2 6% 3 3 4 3 4 5% 45%	2176
	21st to end	Day	18% 7% 2 6% 4 4 4 2 4 8% 42%	2047
October	1st to 10th	Day	18% 8% 2 6% 4 4 4 4 5% 8% 38%	1900
	11th to 20th	Day	19% 10% 2 6% 4 3 5% 4 6% 7% 33%	1900
	21st to end	Day	18% 14% 4 7% 5% 4 4 2 4 6% 31%	2090
November	1st to 10th	Day	19% 15% 4 9% 5% 5% 4 3 4 5% 28%	1612
	11th to 20th	Day	18% 20% 7% 9% 6% 4 3 3 4 4 22%	1600
	21st to end	Day	19% 19% 6% 11% 6% 5% 4 3 4 4 20%	1600
December	1st to 10th	Day	21% 20% 8% 14% 5% 4 3 4 2 4 15%	1584
	11th to 20th	Day	24% 19% 7% 14% 9% 4 3 2 3 3 13%	1906
	21st to end	Day	21% 16% 11% 15% 7% 4 3 2 3 4 14%	2679
January	1st to 10th	Night	14% 14% 7% 20% 8% 5% 4 3 4 4 18%	4611
	11th to 20th	Night	15% 17% 7% 19% 7% 6% 4 3 4 4 14%	4308
	21st to end	Night	16% 14% 6% 16% 11% 5% 4 3 5% 5% 15%	4532
February	1st to 10th	Night	18% 16% 5% 14% 10% 6% 3 4 4 4 16%	2470
	11th to 20th	Night	17% 15% 6% 12% 10% 7% 4 3 5% 4 18%	2403
	21st to end	Night	11% 16% 5% 11% 7% 5% 5% 3 4 4 27%	2021
March	1st to 10th	Night	22% 16% 4 13% 8% 5% 3 2 3 3 22%	3410
	11th to 20th	Night	16% 21% 7% 10% 5% 5% 5% 4 4 5% 19%	3479
	21st to end	Night	23% 16% 6% 11% 5% 4 3 2 3 3 24%	3816
April	1st to 10th	Night	21% 15% 4 7% 6% 4 4 3 4 3 28%	1929
	11th to 20th	Night	21% 13% 3 8% 4 3 4 3 4 6% 32%	1770
	21st to end	Night	22% 13% 3 6% 6% 4 3 3 5% 5% 31%	1710
May	1st to 10th	Night	22% 18% 2 6% 4 5% 4 3 5% 6% 25%	2774
	11th to 20th	Night	19% 11% 3 6% 4 4 5% 4 5% 8% 31%	2506
	21st to end	Night	15% 9% 3 9% 5% 5% 5% 4 6% 8% 31%	2749
June	1st to 10th	Night	25% 8% 2 6% 5% 4 4 4 5% 9% 27%	1518
	11th to 20th	Night	20% 9% 3 6% 5% 4 5% 3 5% 6% 35%	1330
	21st to end	Night	22% 10% 2 6% 5% 4 5% 5% 5% 7% 28%	1330
July	1st to 10th	Night	16% 11% 3 9% 5% 4 5% 4 7% 8% 28%	2210
	11th to 20th	Night	16% 9% 2 6% 5% 5% 4 5% 6% 10% 33%	2452
	21st to end	Night	12% 7% 3 6% 4 5% 5% 4 6% 8% 40%	2923
August	1st to 10th	Night	20% 10% 3 6% 4 4 4 3 6% 7% 33%	2825
	11th to 20th	Night	12% 8% 3 7% 5% 5% 5% 4 6% 8% 36%	2782
	21st to end	Night	14% 4 2 5% 3 4 4 3 6% 8% 48%	3267
September	1st to 10th	Night	13% 7% 2 6% 4 4 4 4 6% 7% 45%	1900
	11th to 20th	Night	17% 8% 3 5% 3 3 3 3 5% 7% 44%	2000
	21st to end	Night	17% 7% 2 6% 4 4 5% 3 6% 6% 39%	2131
October	1st to 10th	Night	18% 7% 2 5% 4 4 5% 4 5% 7% 40%	2280
	11th to 20th	Night	18% 9% 2 7% 5% 4 4 4 5% 7% 36%	2280
	21st to end	Night	24% 12% 3 6% 4 3 3 3 4 6% 31%	2508
November	1st to 10th	Night	21% 12% 4 7% 5% 4 4 3 4 5% 31%	2683
	11th to 20th	Night	18% 19% 5% 10% 6% 4 5% 3 4 5% 21%	2800
	21st to end	Night	21% 18% 6% 10% 4 4 4 3 4 5% 22%	2800
December	1st to 10th	Night	20% 19% 6% 14% 7% 4 4 3 4 5% 15%	2779
	11th to 20th	Night	21% 20% 7% 14% 8% 5% 2 2 3 3 15%	3293
	21st to end	Night	24% 18% 7% 12% 5% 3 3 2 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	68% 5% 17% 9% 2	2332
	11th to 20th	Day	75% 4 9% 10% 2	2655
	21st to end	Day	68% 5% 12% 9% 6%	3124
February	1st to 10th	Day	72% 5% 8% 9% 5% 1	1710
	11th to 20th	Day	71% 6% 9% 10% 4	1671
	21st to end	Day	57% 5% 11% 17% 9% 1	1431
March	1st to 10th	Day	67% 3 8% 15% 5% 1	3434
	11th to 20th	Day	63% 5% 11% 12% 8% 1	3480
	21st to end	Day	71% 3 5% 12% 8% 1	3816
April	1st to 10th	Day	61% 4 7% 14% 11% 3	2251
	11th to 20th	Day	50% 4 9% 22% 13% 1	2356
	21st to end	Day	55% 4 10% 18% 12% 2	2470
May	1st to 10th	Day	60% 7% 9% 15% 7% 1	4179
	11th to 20th	Day	50% 7% 14% 20% 9% 1	4402
	21st to end	Day	45% 8% 16% 18% 12%	4836
June	1st to 10th	Day	57% 6% 9% 20% 7%	2675
	11th to 20th	Day	49% 7% 13% 19% 10% 1	2850
	21st to end	Day	57% 7% 9% 16% 10% 1	2850
July	1st to 10th	Day	50% 5% 12% 19% 12% 1	4685
	11th to 20th	Day	46% 7% 14% 23% 8%	4406
	21st to end	Day	47% 7% 15% 22% 9%	4484
August	1st to 10th	Day	55% 6% 10% 19% 9%	4092
	11th to 20th	Day	44% 8% 13% 24% 11%	4084
	21st to end	Day	34% 6% 14% 28% 18% 1	4387
September	1st to 10th	Day	41% 5% 13% 26% 13% 2	2280
	11th to 20th	Day	42% 4 12% 25% 16% 1	2176
	21st to end	Day	42% 4 9% 28% 15% 1	2047
October	1st to 10th	Day	45% 6% 12% 26% 11%	3160
	11th to 20th	Day	46% 5% 9% 27% 13%	3140
	21st to end	Day	47% 4 14% 22% 13%	3428
November	1st to 10th	Day	59% 5% 10% 17% 8% 1	1612
	11th to 20th	Day	65% 5% 13% 13% 4 1	1600
	21st to end	Day	68% 7% 11% 11% 3	1600
December	1st to 10th	Day	74% 5% 8% 10% 3	1584
	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	67% 6% 14% 11% 1	4611
	11th to 20th	Night	72% 6% 10% 8% 4	4308
	21st to end	Night	69% 6% 11% 11% 2	4532
February	1st to 10th	Night	72% 5% 8% 9% 5%	2470
	11th to 20th	Night	68% 6% 10% 11% 5% 1	2406
	21st to end	Night	58% 5% 10% 17% 8% 1	2021
March	1st to 10th	Night	69% 4 6% 13% 7% 1	3419
	11th to 20th	Night	66% 6% 10% 11% 6% 1	3480
	21st to end	Night	67% 3 7% 13% 8% 1	3816
April	1st to 10th	Night	61% 5% 9% 12% 11% 3	1929
	11th to 20th	Night	54% 4 8% 19% 14% 1	1770
	21st to end	Night	55% 7% 10% 15% 12% 2	1710
May	1st to 10th	Night	60% 7% 13% 13% 6% 1	2780
	11th to 20th	Night	50% 8% 14% 21% 6% 1	2507
	21st to end	Night	50% 9% 17% 18% 5% 1	2750
June	1st to 10th	Night	54% 9% 11% 20% 6%	1518
	11th to 20th	Night	50% 6% 12% 22% 9% 1	1330
	21st to end	Night	54% 9% 11% 16% 8% 2	1330
July	1st to 10th	Night	52% 8% 14% 16% 10% 1	2175
	11th to 20th	Night	45% 8% 20% 17% 9%	2407
	21st to end	Night	40% 9% 15% 24% 12%	2831
August	1st to 10th	Night	51% 7% 13% 22% 6%	2813
	11th to 20th	Night	43% 10% 16% 23% 8%	2809
	21st to end	Night	34% 6% 16% 27% 16%	3266
September	1st to 10th	Night	37% 8% 11% 28% 14% 1	1900
	11th to 20th	Night	40% 4 12% 29% 15% 1	2000
	21st to end	Night	45% 6% 10% 25% 13% 1	2131
October	1st to 10th	Night	48% 4 12% 25% 11%	3800
	11th to 20th	Night	41% 5% 13% 27% 15%	3779
	21st to end	Night	46% 4 12% 23% 15%	4120
November	1st to 10th	Night	54% 6% 12% 18% 9% 1	2683
	11th to 20th	Night	65% 6% 10% 13% 5%	2800
	21st to end	Night	66% 5% 13% 12% 3	2800
December	1st to 10th	Night	72% 6% 9% 11% 3	2779
	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	31% 26% 29% 10% 3	370
	21st to end	Day	22% 25% 35% 15% 2	407
February	1st to 10th	Day	29% 23% 31% 12% 4 1	370
	11th to 20th	Day	31% 31% 24% 13% 1	366
	21st to end	Day	23% 21% 40% 14% 3	316
March	1st to 10th	Day	28% 24% 33% 12% 3	460
	11th to 20th	Day	26% 24% 33% 13% 3	460
	21st to end	Day	32% 24% 28% 12% 5%	506
April	1st to 10th	Day	38% 22% 27% 11% 2	460
	11th to 20th	Day	24% 25% 33% 13% 4	452
	21st to end	Day	27% 19% 29% 15% 10% 1	460
May	1st to 10th	Day	33% 21% 25% 16% 4 1	496
	11th to 20th	Day	24% 17% 25% 24% 8% 1	674
	21st to end	Day	26% 14% 35% 19% 6% 1	735
June	1st to 10th	Day	30% 13% 26% 23% 7% 1	680
	11th to 20th	Day	26% 12% 32% 23% 7% 1	680
	21st to end	Day	28% 10% 27% 25% 9% 2	680
July	1st to 10th	Day	20% 7% 35% 27% 11% 1	670
	11th to 20th	Day	20% 5% 33% 25% 14% 1	668
	21st to end	Day	22% 7% 30% 29% 11% 1	632
August	1st to 10th	Day	15% 7% 33% 32% 11% 2	486
	11th to 20th	Day	20% 9% 30% 25% 12% 4	479
	21st to end	Day	16% 12% 30% 24% 14% 4	539
September	1st to 10th	Day	21% 10% 33% 24% 11% 2	490
	11th to 20th	Day	22% 14% 26% 25% 12% 2	490
	21st to end	Day	21% 13% 30% 22% 11% 3	467
October	1st to 10th	Day	23% 13% 29% 23% 9% 3	390
	11th to 20th	Day	27% 19% 26% 19% 7% 2	390
	21st to end	Day	26% 21% 28% 19% 5% 1	429
November	1st to 10th	Day	31% 17% 30% 17% 3 1	395
	11th to 20th	Day	37% 21% 24% 13% 5%	400
	21st to end	Day	33% 22% 31% 11% 2 1	400
December	1st to 10th	Day	34% 24% 27% 13% 3	394
	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	30% 23% 29% 15% 3	812
	21st to end	Night	23% 25% 33% 14% 4	836
February	1st to 10th	Night	31% 24% 28% 14% 3	760
	11th to 20th	Night	31% 26% 30% 12% 2	743
	21st to end	Night	23% 22% 32% 18% 4	628
March	1st to 10th	Night	27% 22% 32% 16% 3	760
	11th to 20th	Night	24% 19% 30% 21% 5%	760
	21st to end	Night	28% 19% 32% 15% 6%	836
April	1st to 10th	Night	32% 18% 31% 16% 3	599
	11th to 20th	Night	27% 18% 34% 17% 5%	564
	21st to end	Night	28% 16% 31% 19% 5% 1	570
May	1st to 10th	Night	31% 12% 28% 22% 6% 1	570
	11th to 20th	Night	25% 11% 28% 28% 7%	562
	21st to end	Night	21% 12% 36% 26% 5%	616
June	1st to 10th	Night	28% 11% 29% 26% 6%	568
	11th to 20th	Night	24% 8% 26% 35% 6% 1	380
	21st to end	Night	25% 8% 27% 31% 9% 1	380
July	1st to 10th	Night	19% 6% 29% 37% 8%	370
	11th to 20th	Night	16% 7% 28% 37% 12%	503
	21st to end	Night	18% 5% 26% 41% 9%	623
August	1st to 10th	Night	18% 5% 26% 39% 12% 1	568
	11th to 20th	Night	17% 7% 26% 32% 17% 1	562
	21st to end	Night	17% 7% 25% 34% 16% 1	627
September	1st to 10th	Night	16% 8% 31% 33% 12% 1	570
	11th to 20th	Night	19% 10% 27% 31% 12% 1	670
	21st to end	Night	21% 10% 30% 27% 9% 1	760
October	1st to 10th	Night	21% 13% 30% 26% 10% 1	760
	11th to 20th	Night	25% 15% 32% 19% 8% 1	760
	21st to end	Night	33% 20% 23% 19% 4	836
November	1st to 10th	Night	29% 19% 28% 19% 5%	860
	11th to 20th	Night	33% 21% 25% 17% 4	900
	21st to end	Night	34% 20% 28% 16% 2	900
December	1st to 10th	Night	33% 22% 27% 15% 3	893
	11th to 20th	Night	34% 25% 27% 11% 3	850
	21st to end	Night	32% 23% 27% 15% 3	935

Page generated at 2024-12-06 04:54:48. Version ac07

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