Parrsboro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Parrsboro 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	20% 11% 4 8% 5% 4 4 3 5% 6% 29%	102209
	Night	21% 11% 4 8% 5% 4 4 3 5% 6% 29%	97615
Transparency	Day	53% 7% 12% 19% 8% 1	105800
	Night	55% 7% 12% 18% 8% 1	102113
Seeing	Day	25% 12% 28% 25% 9% 1	17217
	Night	25% 14% 30% 24% 7%	24706

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% 15% 4 10% 5% 5% 5% 3 4 5% 28%	2268
	11th to 20th	Day	16% 18% 7% 12% 6% 4 3 3 4 5% 23%	2606
	21st to end	Day	15% 11% 4 11% 6% 5% 5% 4 6% 8% 25%	3124
February	1st to 10th	Day	20% 13% 4 10% 6% 4 5% 3 6% 6% 23%	1710
	11th to 20th	Day	17% 15% 5% 12% 6% 4 4 4 5% 5% 23%	1663
	21st to end	Day	13% 14% 5% 9% 6% 4 3 3 6% 8% 30%	1422
March	1st to 10th	Day	23% 14% 5% 10% 4 5% 4 3 4 4 24%	3430
	11th to 20th	Day	14% 21% 8% 11% 5% 3 4 2 3 5% 24%	3480
	21st to end	Day	30% 16% 4 9% 4 3 3 3 4 3 20%	3816
April	1st to 10th	Day	24% 15% 4 8% 5% 5% 4 3 4 5% 25%	2261
	11th to 20th	Day	20% 10% 4 7% 5% 4 4 4 4 6% 32%	2354
	21st to end	Day	22% 12% 3 8% 4 4 4 4 5% 6% 29%	2470
May	1st to 10th	Day	22% 16% 4 8% 5% 4 4 3 5% 6% 23%	4202
	11th to 20th	Day	18% 10% 3 8% 6% 4 4 3 5% 6% 33%	4398
	21st to end	Day	19% 9% 3 8% 6% 5% 5% 4 7% 8% 27%	4836
June	1st to 10th	Day	26% 11% 3 7% 5% 4 4 4 5% 6% 25%	2693
	11th to 20th	Day	22% 8% 2 7% 5% 3 5% 4 6% 6% 32%	2850
	21st to end	Day	28% 10% 3 7% 5% 4 4 3 4 5% 27%	2850
July	1st to 10th	Day	23% 10% 3 6% 4 4 5% 4 5% 7% 30%	4760
	11th to 20th	Day	24% 9% 3 5% 3 4 4 3 5% 7% 32%	4513
	21st to end	Day	17% 8% 3 8% 4 4 4 4 7% 8% 33%	4673
August	1st to 10th	Day	22% 11% 4 7% 5% 4 5% 4 5% 6% 27%	4105
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 4 7% 7% 35%	4045
	21st to end	Day	11% 6% 2 6% 5% 4 5% 4 6% 7% 46%	4386
September	1st to 10th	Day	17% 6% 3 6% 4 4 4 3 4 6% 41%	2280
	11th to 20th	Day	18% 7% 2 6% 4 3 4 3 4 6% 41%	2190
	21st to end	Day	19% 7% 3 5% 3 4 3 3 5% 7% 41%	2042
October	1st to 10th	Day	17% 8% 3 7% 5% 4 4 3 5% 6% 37%	1900
	11th to 20th	Day	21% 9% 2 5% 5% 4 5% 3 5% 7% 34%	1900
	21st to end	Day	20% 12% 3 8% 4 4 5% 2 4 5% 33%	2090
November	1st to 10th	Day	23% 11% 3 8% 4 5% 4 3 5% 5% 29%	1593
	11th to 20th	Day	22% 14% 4 8% 5% 4 3 3 4 5% 29%	1600
	21st to end	Day	21% 15% 5% 9% 5% 4 4 3 4 4 26%	1600
December	1st to 10th	Day	25% 14% 5% 9% 5% 4 3 3 3 5% 24%	1584
	11th to 20th	Day	27% 16% 5% 9% 5% 4 4 3 3 4 22%	1906
	21st to end	Day	20% 14% 7% 14% 5% 4 4 3 4 6% 20%	2609
January	1st to 10th	Night	14% 13% 4 8% 5% 4 4 3 6% 7% 31%	4679
	11th to 20th	Night	21% 14% 6% 11% 5% 4 3 3 5% 6% 23%	4344
	21st to end	Night	16% 12% 4 11% 7% 4 5% 4 5% 7% 25%	4532
February	1st to 10th	Night	20% 14% 4 9% 6% 5% 4 3 5% 6% 24%	2470
	11th to 20th	Night	18% 12% 4 11% 7% 5% 4 3 5% 5% 25%	2403
	21st to end	Night	13% 14% 5% 8% 6% 5% 5% 3 5% 5% 31%	2031
March	1st to 10th	Night	24% 12% 4 12% 6% 5% 4 2 3 3 24%	3410
	11th to 20th	Night	18% 17% 8% 10% 5% 5% 4 4 5% 6% 20%	3479
	21st to end	Night	31% 11% 5% 8% 5% 4 3 2 3 4 24%	3816
April	1st to 10th	Night	24% 14% 3 8% 5% 4 4 3 5% 4 26%	1919
	11th to 20th	Night	22% 10% 4 7% 5% 4 4 4 4 6% 31%	1774
	21st to end	Night	24% 11% 3 6% 4 4 4 3 5% 5% 31%	1710
May	1st to 10th	Night	22% 16% 4 8% 5% 4 3 3 6% 6% 24%	2741
	11th to 20th	Night	19% 9% 2 6% 4 4 4 4 6% 8% 33%	2506
	21st to end	Night	20% 11% 5% 8% 5% 5% 4 3 5% 6% 27%	2749
June	1st to 10th	Night	25% 11% 3 8% 5% 5% 4 3 5% 7% 24%	1500
	11th to 20th	Night	23% 8% 2 8% 3 4 3 3 5% 6% 35%	1330
	21st to end	Night	25% 9% 3 8% 6% 5% 5% 3 5% 6% 23%	1330
July	1st to 10th	Night	22% 14% 3 8% 5% 4 5% 4 6% 7% 22%	2210
	11th to 20th	Night	24% 11% 2 7% 4 4 4 4 6% 7% 26%	2424
	21st to end	Night	17% 8% 3 7% 4 5% 5% 4 6% 8% 35%	2871
August	1st to 10th	Night	25% 10% 3 7% 4 4 5% 3 5% 7% 27%	2825
	11th to 20th	Night	17% 10% 3 8% 4 4 5% 4 6% 7% 31%	2782
	21st to end	Night	14% 7% 2 6% 4 4 4 3 5% 8% 43%	3270
September	1st to 10th	Night	15% 7% 3 6% 4 4 4 3 5% 8% 40%	1900
	11th to 20th	Night	18% 6% 2 5% 4 3 3 3 5% 6% 44%	1987
	21st to end	Night	19% 6% 3 6% 4 5% 3 3 4 7% 39%	2137
October	1st to 10th	Night	19% 7% 3 6% 4 3 4 4 6% 6% 39%	2280
	11th to 20th	Night	20% 9% 3 6% 5% 4 3 3 5% 6% 37%	2280
	21st to end	Night	26% 9% 2 6% 4 4 4 3 4 5% 33%	2508
November	1st to 10th	Night	22% 8% 3 7% 4 4 5% 3 5% 6% 32%	2701
	11th to 20th	Night	21% 12% 5% 8% 5% 4 4 4 6% 4 27%	2800
	21st to end	Night	24% 12% 4 8% 5% 4 3 3 5% 6% 26%	2800
December	1st to 10th	Night	25% 14% 4 7% 5% 4 4 3 5% 6% 23%	2779
	11th to 20th	Night	29% 14% 3 8% 5% 3 4 2 4 5% 23%	3293
	21st to end	Night	25% 14% 5% 12% 4 3 3 2 3 3 24%	5045

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	57% 10% 13% 13% 7% 1	2269
	11th to 20th	Day	63% 6% 10% 17% 5%	2606
	21st to end	Day	53% 11% 14% 13% 8%	3124
February	1st to 10th	Day	62% 7% 10% 12% 8% 1	1710
	11th to 20th	Day	61% 8% 12% 11% 7% 1	1671
	21st to end	Day	52% 6% 12% 18% 10% 2	1422
March	1st to 10th	Day	60% 8% 9% 17% 5% 1	3434
	11th to 20th	Day	59% 9% 11% 14% 7% 1	3480
	21st to end	Day	67% 6% 7% 12% 8% 1	3816
April	1st to 10th	Day	60% 5% 8% 13% 10% 2	2261
	11th to 20th	Day	52% 6% 9% 20% 12% 1	2354
	21st to end	Day	55% 6% 11% 17% 10% 2	2470
May	1st to 10th	Day	59% 9% 10% 16% 6%	4216
	11th to 20th	Day	47% 11% 15% 21% 6%	4402
	21st to end	Day	47% 12% 17% 17% 7%	4836
June	1st to 10th	Day	57% 8% 12% 17% 5%	2693
	11th to 20th	Day	50% 8% 12% 20% 8% 1	2850
	21st to end	Day	58% 7% 10% 16% 9% 1	2850
July	1st to 10th	Day	53% 5% 11% 19% 10% 1	4685
	11th to 20th	Day	51% 6% 12% 23% 7%	4434
	21st to end	Day	49% 6% 16% 23% 6%	4524
August	1st to 10th	Day	56% 7% 11% 20% 6%	4092
	11th to 20th	Day	47% 6% 12% 23% 11% 1	4084
	21st to end	Day	37% 4 13% 29% 16% 1	4386
September	1st to 10th	Day	41% 7% 13% 25% 12% 1	2280
	11th to 20th	Day	43% 5% 12% 24% 13% 1	2190
	21st to end	Day	42% 5% 11% 27% 14% 1	2042
October	1st to 10th	Day	48% 3 10% 28% 11%	3160
	11th to 20th	Day	47% 5% 8% 30% 9%	3140
	21st to end	Day	46% 3 15% 20% 15%	3428
November	1st to 10th	Day	56% 6% 10% 19% 7% 1	1593
	11th to 20th	Day	58% 5% 14% 15% 7% 1	1600
	21st to end	Day	62% 7% 12% 13% 6%	1600
December	1st to 10th	Day	64% 7% 10% 14% 5%	1584
	11th to 20th	Day	67% 6% 9% 13% 4 1	1905
	21st to end	Day	63% 12% 11% 9% 4	2609
January	1st to 10th	Night	51% 11% 15% 19% 5%	4679
	11th to 20th	Night	61% 8% 10% 15% 5%	4344
	21st to end	Night	59% 8% 11% 16% 5% 1	4532
February	1st to 10th	Night	62% 7% 11% 12% 7% 1	2470
	11th to 20th	Night	59% 8% 11% 14% 8% 1	2406
	21st to end	Night	55% 6% 11% 17% 10% 2	2031
March	1st to 10th	Night	66% 5% 6% 14% 8% 1	3419
	11th to 20th	Night	63% 10% 8% 12% 7% 1	3480
	21st to end	Night	66% 4 7% 14% 8% 1	3816
April	1st to 10th	Night	60% 6% 8% 13% 10% 3	1919
	11th to 20th	Night	53% 6% 9% 19% 12% 1	1774
	21st to end	Night	54% 7% 11% 15% 11% 2	1710
May	1st to 10th	Night	59% 9% 14% 12% 6% 1	2747
	11th to 20th	Night	46% 12% 14% 23% 5% 1	2507
	21st to end	Night	54% 12% 15% 15% 5%	2750
June	1st to 10th	Night	59% 8% 10% 17% 5%	1500
	11th to 20th	Night	51% 6% 11% 22% 8% 1	1330
	21st to end	Night	59% 8% 11% 14% 7% 1	1330
July	1st to 10th	Night	59% 8% 11% 13% 9% 1	2175
	11th to 20th	Night	54% 7% 15% 16% 8%	2380
	21st to end	Night	47% 6% 15% 21% 10%	2780
August	1st to 10th	Night	56% 6% 13% 20% 5%	2813
	11th to 20th	Night	49% 7% 15% 19% 9%	2809
	21st to end	Night	40% 5% 16% 25% 15%	3269
September	1st to 10th	Night	41% 8% 11% 27% 12% 1	1900
	11th to 20th	Night	40% 6% 13% 27% 12% 1	1987
	21st to end	Night	44% 6% 11% 27% 11% 1	2137
October	1st to 10th	Night	49% 5% 9% 27% 10%	3800
	11th to 20th	Night	40% 4 11% 29% 15%	3779
	21st to end	Night	45% 3 14% 22% 16%	4120
November	1st to 10th	Night	51% 9% 13% 18% 8% 1	2701
	11th to 20th	Night	58% 8% 12% 14% 7%	2800
	21st to end	Night	59% 9% 14% 14% 4	2800
December	1st to 10th	Night	62% 7% 10% 16% 4	2779
	11th to 20th	Night	65% 6% 10% 13% 6%	3295
	21st to end	Night	64% 9% 10% 12% 4 1	5045

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	24% 26% 27% 20% 3	215
	11th to 20th	Day	31% 18% 34% 14% 4 1	370
	21st to end	Day	22% 11% 40% 23% 4	407
February	1st to 10th	Day	28% 14% 33% 20% 4 1	370
	11th to 20th	Day	23% 22% 36% 16% 3	366
	21st to end	Day	22% 16% 35% 23% 4	310
March	1st to 10th	Day	22% 20% 35% 19% 4	460
	11th to 20th	Day	18% 21% 33% 22% 6%	460
	21st to end	Day	28% 16% 31% 18% 5%	506
April	1st to 10th	Day	32% 17% 32% 15% 3	460
	11th to 20th	Day	23% 14% 35% 20% 7%	452
	21st to end	Day	25% 13% 27% 26% 8% 1	460
May	1st to 10th	Day	31% 11% 30% 22% 6% 1	520
	11th to 20th	Day	23% 7% 31% 28% 9% 1	674
	21st to end	Day	27% 9% 27% 30% 7% 1	735
June	1st to 10th	Day	30% 8% 26% 27% 9%	680
	11th to 20th	Day	25% 8% 26% 31% 9% 1	680
	21st to end	Day	31% 7% 21% 30% 9% 3	680
July	1st to 10th	Day	24% 4 26% 33% 13% 1	670
	11th to 20th	Day	23% 5% 22% 33% 16% 1	668
	21st to end	Day	23% 5% 23% 34% 14% 1	660
August	1st to 10th	Day	19% 2 22% 38% 17% 1	486
	11th to 20th	Day	22% 6% 24% 32% 13% 3	479
	21st to end	Day	17% 7% 24% 30% 19% 2	539
September	1st to 10th	Day	17% 6% 29% 33% 14% 1	490
	11th to 20th	Day	19% 8% 28% 30% 13% 2	490
	21st to end	Day	20% 8% 27% 27% 15% 2	464
October	1st to 10th	Day	21% 9% 25% 29% 13% 2	390
	11th to 20th	Day	25% 13% 27% 24% 10% 1	390
	21st to end	Day	25% 15% 32% 21% 6% 1	429
November	1st to 10th	Day	28% 16% 28% 21% 7% 1	395
	11th to 20th	Day	29% 20% 29% 16% 5%	400
	21st to end	Day	31% 19% 33% 14% 3	400
December	1st to 10th	Day	35% 15% 28% 19% 2	394
	11th to 20th	Day	33% 24% 27% 14% 2	370
	21st to end	Day	28% 19% 32% 16% 4 1	298
January	1st to 10th	Night	27% 20% 31% 19% 3	850
	11th to 20th	Night	30% 19% 30% 18% 4	823
	21st to end	Night	21% 21% 34% 19% 5%	836
February	1st to 10th	Night	26% 21% 33% 17% 3	760
	11th to 20th	Night	26% 22% 32% 16% 3 1	743
	21st to end	Night	20% 16% 37% 21% 5% 1	628
March	1st to 10th	Night	23% 17% 36% 21% 3	760
	11th to 20th	Night	22% 17% 30% 24% 6%	760
	21st to end	Night	25% 14% 34% 20% 6%	836
April	1st to 10th	Night	29% 14% 32% 20% 4	589
	11th to 20th	Night	26% 13% 33% 23% 5%	564
	21st to end	Night	31% 10% 32% 21% 6% 1	570
May	1st to 10th	Night	28% 10% 29% 25% 6% 1	570
	11th to 20th	Night	27% 9% 25% 30% 9%	562
	21st to end	Night	21% 8% 36% 29% 5%	616
June	1st to 10th	Night	27% 8% 27% 29% 8% 1	550
	11th to 20th	Night	24% 6% 29% 33% 7%	380
	21st to end	Night	26% 5% 24% 34% 10% 1	380
July	1st to 10th	Night	25% 5% 20% 41% 9%	370
	11th to 20th	Night	19% 7% 25% 38% 10%	489
	21st to end	Night	21% 6% 22% 41% 10%	623
August	1st to 10th	Night	20% 3 24% 39% 13% 1	568
	11th to 20th	Night	21% 4 27% 34% 13% 1	562
	21st to end	Night	18% 6% 23% 37% 15% 1	627
September	1st to 10th	Night	17% 6% 32% 34% 11% 1	570
	11th to 20th	Night	20% 7% 26% 34% 12% 1	657
	21st to end	Night	21% 9% 29% 28% 11% 1	760
October	1st to 10th	Night	23% 8% 28% 30% 11% 1	760
	11th to 20th	Night	23% 12% 33% 21% 9% 1	760
	21st to end	Night	30% 16% 28% 20% 5%	836
November	1st to 10th	Night	27% 16% 31% 21% 5% 1	869
	11th to 20th	Night	27% 19% 28% 20% 6% 1	900
	21st to end	Night	30% 20% 28% 19% 3	900
December	1st to 10th	Night	33% 18% 29% 18% 3	893
	11th to 20th	Night	30% 22% 32% 13% 2	850
	21st to end	Night	29% 19% 28% 19% 4	935

Page generated at 2024-12-06 04:54:47. Version ac07

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