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 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	20% 12% 4 9% 5% 4 4 3 5% 6% 29%	132043
	Night	20% 12% 4 8% 5% 4 4 3 5% 6% 28%	129878
Transparency	Day	55% 6% 11% 19% 9% 1	135616
	Night	56% 5% 11% 18% 9% 1	134392
Seeing	Day	26% 12% 28% 24% 8% 1	18950
	Night	26% 14% 30% 24% 6%	26536

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	14% 17% 6% 14% 7% 6% 5% 3 4 5% 21%	4210
	11th to 20th	Day	18% 19% 8% 15% 6% 4 3 2 3 4 18%	4835
	21st to end	Day	12% 10% 4 11% 6% 5% 6% 5% 6% 8% 28%	5781
February	1st to 10th	Day	18% 13% 4 11% 7% 5% 5% 4 6% 6% 22%	1890
	11th to 20th	Day	17% 14% 4 13% 6% 4 4 4 5% 5% 25%	1843
	21st to end	Day	12% 14% 5% 9% 6% 4 3 3 6% 8% 30%	1566
March	1st to 10th	Day	22% 13% 5% 14% 5% 5% 3 3 4 4 23%	5040
	11th to 20th	Day	16% 17% 6% 10% 4 4 4 3 4 6% 27%	5090
	21st to end	Day	27% 16% 4 9% 4 3 4 3 4 4 20%	5587
April	1st to 10th	Day	25% 14% 4 8% 5% 5% 3 3 4 5% 25%	2391
	11th to 20th	Day	20% 10% 4 7% 5% 4 4 4 4 6% 31%	2480
	21st to end	Day	22% 12% 3 8% 4 4 4 4 5% 6% 29%	2600
May	1st to 10th	Day	27% 15% 4 8% 5% 4 4 4 5% 5% 20%	6024
	11th to 20th	Day	19% 12% 4 9% 6% 4 4 3 5% 6% 29%	6318
	21st to end	Day	20% 10% 3 7% 5% 4 4 3 6% 8% 28%	6948
June	1st to 10th	Day	25% 11% 3 7% 5% 4 5% 5% 5% 6% 25%	2835
	11th to 20th	Day	21% 8% 3 7% 5% 3 5% 4 6% 6% 32%	3000
	21st to end	Day	27% 10% 3 7% 5% 4 4 3 4 6% 27%	3000
July	1st to 10th	Day	21% 11% 3 7% 5% 4 5% 4 6% 7% 27%	6820
	11th to 20th	Day	22% 10% 3 5% 3 4 4 3 5% 7% 35%	6461
	21st to end	Day	14% 8% 3 7% 4 4 5% 4 7% 8% 37%	6729
August	1st to 10th	Day	21% 10% 4 7% 5% 4 5% 3 5% 7% 29%	4235
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 4 7% 7% 35%	4175
	21st to end	Day	11% 6% 2 6% 5% 4 5% 4 6% 7% 46%	4525
September	1st to 10th	Day	17% 6% 3 6% 4 4 4 3 5% 7% 41%	2400
	11th to 20th	Day	18% 7% 2 6% 4 3 4 3 4 7% 42%	2305
	21st to end	Day	18% 6% 3 6% 3 3 3 3 5% 7% 42%	2149
October	1st to 10th	Day	17% 8% 3 7% 5% 4 4 3 5% 6% 39%	2000
	11th to 20th	Day	20% 10% 2 6% 5% 4 5% 3 5% 7% 33%	2000
	21st to end	Day	20% 11% 3 8% 4 4 5% 3 4 5% 33%	2200
November	1st to 10th	Day	23% 11% 3 8% 4 5% 4 3 4 5% 29%	1674
	11th to 20th	Day	21% 15% 4 8% 5% 4 3 3 4 5% 28%	1680
	21st to end	Day	21% 15% 5% 9% 5% 4 4 3 4 4 26%	1680
December	1st to 10th	Day	22% 13% 6% 9% 6% 4 3 2 4 6% 26%	2690
	11th to 20th	Day	27% 13% 4 8% 4 4 3 3 3 4 28%	3076
	21st to end	Day	19% 15% 5% 13% 5% 3 4 3 4 5% 24%	3806
January	1st to 10th	Night	13% 16% 5% 10% 6% 5% 4 3 5% 7% 25%	8678
	11th to 20th	Night	22% 15% 6% 13% 6% 4 4 3 4 5% 19%	8054
	21st to end	Night	10% 12% 4 9% 7% 5% 5% 4 5% 7% 30%	8400
February	1st to 10th	Night	18% 14% 4 11% 6% 5% 4 3 5% 6% 24%	2730
	11th to 20th	Night	17% 12% 4 10% 7% 5% 4 4 5% 5% 27%	2663
	21st to end	Night	13% 14% 5% 8% 6% 5% 5% 3 5% 5% 31%	2238
March	1st to 10th	Night	26% 13% 4 11% 6% 4 3 2 3 3 24%	5020
	11th to 20th	Night	19% 14% 6% 10% 5% 4 4 3 4 5% 26%	5089
	21st to end	Night	30% 13% 5% 8% 5% 4 4 3 3 4 24%	5587
April	1st to 10th	Night	25% 14% 3 8% 5% 4 3 3 4 4 26%	2032
	11th to 20th	Night	22% 10% 4 6% 5% 4 4 4 4 6% 31%	1868
	21st to end	Night	24% 11% 3 7% 4 4 4 3 5% 5% 30%	1800
May	1st to 10th	Night	29% 15% 4 7% 4 3 3 3 5% 5% 22%	3922
	11th to 20th	Night	24% 10% 3 6% 4 4 4 4 5% 6% 30%	3596
	21st to end	Night	19% 12% 5% 8% 6% 5% 4 3 5% 6% 29%	3948
June	1st to 10th	Night	24% 11% 3 8% 4 5% 4 3 5% 7% 25%	1579
	11th to 20th	Night	22% 8% 2 8% 3 4 3 3 5% 6% 35%	1400
	21st to end	Night	25% 9% 3 8% 6% 5% 5% 3 5% 6% 24%	1400
July	1st to 10th	Night	22% 12% 3 9% 6% 5% 6% 4 6% 7% 19%	3160
	11th to 20th	Night	20% 11% 3 7% 4 4 5% 4 6% 7% 29%	3472
	21st to end	Night	17% 9% 3 7% 4 4 4 4 6% 8% 34%	4121
August	1st to 10th	Night	24% 10% 3 7% 4 4 5% 3 5% 7% 29%	2915
	11th to 20th	Night	17% 10% 3 8% 4 4 5% 4 6% 7% 32%	2872
	21st to end	Night	14% 7% 2 6% 4 4 4 3 5% 8% 43%	3373
September	1st to 10th	Night	15% 7% 3 6% 4 4 4 3 5% 7% 41%	2000
	11th to 20th	Night	17% 7% 2 5% 4 3 3 3 5% 6% 44%	2092
	21st to end	Night	19% 6% 3 6% 4 5% 4 4 5% 7% 39%	2250
October	1st to 10th	Night	18% 7% 3 6% 4 3 4 4 5% 6% 41%	2400
	11th to 20th	Night	19% 9% 3 7% 5% 4 4 3 5% 6% 36%	2400
	21st to end	Night	26% 9% 2 6% 4 4 4 3 4 5% 32%	2640
November	1st to 10th	Night	23% 8% 3 7% 4 4 5% 3 5% 7% 32%	2840
	11th to 20th	Night	21% 13% 5% 8% 5% 4 4 4 5% 4 27%	2940
	21st to end	Night	23% 12% 4 8% 5% 4 4 3 5% 6% 26%	2940
December	1st to 10th	Night	18% 13% 4 8% 5% 4 4 4 5% 7% 28%	4720
	11th to 20th	Night	26% 13% 4 7% 4 3 3 2 3 5% 28%	5353
	21st to end	Night	24% 15% 4 10% 4 3 3 2 4 4 27%	7386

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	66% 6% 10% 12% 7%	4211
	11th to 20th	Day	71% 4 7% 14% 4	4864
	21st to end	Day	52% 6% 9% 16% 13% 3	5781
February	1st to 10th	Day	63% 6% 10% 12% 8% 2	1890
	11th to 20th	Day	61% 7% 11% 13% 7% 1	1851
	21st to end	Day	53% 5% 12% 17% 11% 2	1566
March	1st to 10th	Day	64% 5% 7% 13% 8% 2	5044
	11th to 20th	Day	57% 7% 12% 17% 6% 1	5090
	21st to end	Day	68% 4 5% 15% 8% 1	5587
April	1st to 10th	Day	61% 5% 8% 13% 11% 2	2391
	11th to 20th	Day	53% 6% 9% 20% 12% 1	2480
	21st to end	Day	55% 5% 10% 18% 10% 2	2600
May	1st to 10th	Day	64% 7% 8% 14% 6%	6035
	11th to 20th	Day	53% 8% 12% 21% 5%	6322
	21st to end	Day	49% 9% 13% 20% 8%	6948
June	1st to 10th	Day	57% 8% 12% 18% 5%	2835
	11th to 20th	Day	50% 8% 12% 21% 8% 1	3000
	21st to end	Day	58% 7% 10% 16% 9% 1	3000
July	1st to 10th	Day	56% 4 13% 18% 9% 1	6745
	11th to 20th	Day	49% 4 13% 26% 8% 1	6382
	21st to end	Day	45% 5% 17% 26% 7%	6536
August	1st to 10th	Day	55% 6% 11% 21% 7%	4222
	11th to 20th	Day	46% 6% 13% 23% 11% 1	4214
	21st to end	Day	37% 4 13% 30% 16% 1	4525
September	1st to 10th	Day	41% 7% 13% 25% 13% 1	2400
	11th to 20th	Day	42% 5% 12% 25% 14% 1	2305
	21st to end	Day	42% 5% 11% 27% 15% 1	2149
October	1st to 10th	Day	47% 3 10% 28% 11%	3260
	11th to 20th	Day	47% 5% 8% 30% 9%	3240
	21st to end	Day	47% 3 15% 20% 15%	3538
November	1st to 10th	Day	56% 6% 11% 19% 7% 1	1674
	11th to 20th	Day	59% 5% 14% 15% 7% 1	1680
	21st to end	Day	62% 7% 12% 13% 6%	1680
December	1st to 10th	Day	62% 4 10% 21% 3	2690
	11th to 20th	Day	63% 4 9% 14% 10% 1	3075
	21st to end	Day	61% 8% 8% 14% 8%	3806
January	1st to 10th	Night	58% 6% 11% 19% 6%	8678
	11th to 20th	Night	67% 4 8% 15% 5%	8100
	21st to end	Night	53% 4 8% 18% 14% 3	8400
February	1st to 10th	Night	62% 6% 10% 12% 8% 1	2730
	11th to 20th	Night	58% 7% 10% 16% 8% 1	2666
	21st to end	Night	55% 5% 10% 18% 10% 1	2238
March	1st to 10th	Night	67% 3 4 11% 12% 3	5029
	11th to 20th	Night	60% 7% 12% 13% 8% 1	5090
	21st to end	Night	67% 3 5% 15% 10% 1	5587
April	1st to 10th	Night	60% 6% 8% 13% 11% 3	2032
	11th to 20th	Night	54% 5% 9% 19% 12% 1	1868
	21st to end	Night	55% 6% 11% 15% 11% 2	1800
May	1st to 10th	Night	64% 6% 10% 12% 7% 1	3928
	11th to 20th	Night	53% 8% 11% 21% 5% 2	3597
	21st to end	Night	54% 8% 14% 17% 6%	3949
June	1st to 10th	Night	58% 7% 10% 19% 6%	1579
	11th to 20th	Night	50% 6% 11% 23% 8% 1	1400
	21st to end	Night	59% 7% 12% 14% 7% 1	1400
July	1st to 10th	Night	61% 6% 11% 14% 7% 1	3125
	11th to 20th	Night	52% 5% 15% 19% 8%	3428
	21st to end	Night	49% 5% 16% 20% 11%	4000
August	1st to 10th	Night	55% 6% 12% 21% 5%	2903
	11th to 20th	Night	49% 6% 16% 19% 10%	2899
	21st to end	Night	40% 5% 16% 25% 14%	3372
September	1st to 10th	Night	41% 8% 11% 27% 12% 1	2000
	11th to 20th	Night	40% 5% 13% 28% 12% 1	2092
	21st to end	Night	43% 6% 11% 27% 12% 1	2250
October	1st to 10th	Night	48% 4 10% 27% 11%	3920
	11th to 20th	Night	41% 4 11% 28% 15%	3899
	21st to end	Night	46% 3 14% 22% 15%	4252
November	1st to 10th	Night	52% 9% 12% 18% 9% 1	2840
	11th to 20th	Night	58% 7% 12% 15% 7%	2940
	21st to end	Night	59% 8% 14% 14% 4 1	2940
December	1st to 10th	Night	56% 4 9% 23% 7%	4720
	11th to 20th	Night	61% 4 9% 14% 10% 2	5355
	21st to end	Night	60% 6% 9% 16% 8% 1	7386

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	27% 26% 27% 17% 3	259
	11th to 20th	Day	33% 17% 31% 14% 4	430
	21st to end	Day	23% 14% 37% 21% 4	473
February	1st to 10th	Day	28% 15% 34% 19% 4	430
	11th to 20th	Day	24% 22% 35% 16% 3	426
	21st to end	Day	24% 16% 35% 21% 4	358
March	1st to 10th	Day	26% 20% 33% 18% 3	540
	11th to 20th	Day	22% 22% 31% 20% 5%	540
	21st to end	Day	31% 17% 30% 16% 5%	594
April	1st to 10th	Day	36% 17% 30% 14% 3	504
	11th to 20th	Day	25% 15% 34% 18% 7%	492
	21st to end	Day	26% 15% 27% 24% 7% 1	500
May	1st to 10th	Day	32% 11% 30% 21% 6% 1	563
	11th to 20th	Day	26% 7% 31% 27% 9% 1	724
	21st to end	Day	27% 9% 27% 29% 6% 1	790
June	1st to 10th	Day	30% 8% 25% 27% 9% 1	730
	11th to 20th	Day	25% 9% 27% 30% 9% 1	730
	21st to end	Day	31% 8% 21% 29% 8% 2	730
July	1st to 10th	Day	25% 4 27% 32% 12% 1	720
	11th to 20th	Day	24% 5% 23% 32% 16% 1	718
	21st to end	Day	23% 6% 24% 32% 13% 1	711
August	1st to 10th	Day	18% 3 25% 37% 16% 1	526
	11th to 20th	Day	21% 6% 25% 32% 13% 3	519
	21st to end	Day	18% 8% 26% 28% 18% 2	583
September	1st to 10th	Day	17% 7% 29% 32% 14% 1	530
	11th to 20th	Day	19% 9% 28% 29% 12% 2	530
	21st to end	Day	20% 9% 28% 27% 14% 2	501
October	1st to 10th	Day	21% 10% 27% 28% 13% 2	420
	11th to 20th	Day	25% 13% 28% 24% 10% 1	420
	21st to end	Day	26% 16% 32% 20% 6% 1	462
November	1st to 10th	Day	30% 16% 27% 19% 7% 1	425
	11th to 20th	Day	31% 20% 28% 16% 5%	430
	21st to end	Day	31% 20% 31% 14% 3	430
December	1st to 10th	Day	36% 17% 27% 18% 2	430
	11th to 20th	Day	35% 23% 27% 13% 2	430
	21st to end	Day	29% 20% 32% 15% 3 1	352
January	1st to 10th	Night	27% 20% 31% 19% 3	950
	11th to 20th	Night	30% 18% 29% 19% 4	917
	21st to end	Night	22% 22% 34% 18% 5%	924
February	1st to 10th	Night	25% 21% 34% 17% 3	840
	11th to 20th	Night	27% 22% 32% 17% 3	823
	21st to end	Night	21% 16% 37% 21% 4 1	692
March	1st to 10th	Night	24% 18% 35% 20% 3	840
	11th to 20th	Night	24% 17% 30% 24% 6%	840
	21st to end	Night	27% 15% 33% 19% 6%	924
April	1st to 10th	Night	32% 14% 31% 19% 4	625
	11th to 20th	Night	28% 13% 32% 22% 5%	594
	21st to end	Night	31% 10% 31% 21% 6% 1	600
May	1st to 10th	Night	31% 10% 28% 24% 6% 1	600
	11th to 20th	Night	28% 9% 25% 29% 8%	592
	21st to end	Night	21% 9% 36% 29% 5%	649
June	1st to 10th	Night	28% 8% 27% 29% 8% 1	579
	11th to 20th	Night	25% 6% 30% 32% 7%	400
	21st to end	Night	27% 6% 24% 33% 10% 1	400
July	1st to 10th	Night	25% 5% 21% 40% 9%	390
	11th to 20th	Night	19% 7% 26% 39% 10%	516
	21st to end	Night	21% 7% 23% 39% 10%	656
August	1st to 10th	Night	20% 3 24% 40% 12% 1	598
	11th to 20th	Night	20% 4 27% 35% 13% 1	592
	21st to end	Night	18% 6% 23% 37% 15% 1	660
September	1st to 10th	Night	17% 6% 32% 34% 11% 1	600
	11th to 20th	Night	19% 8% 26% 34% 12% 1	692
	21st to end	Night	21% 9% 30% 29% 11% 1	800
October	1st to 10th	Night	23% 8% 29% 29% 10% 1	800
	11th to 20th	Night	24% 12% 33% 21% 9% 1	800
	21st to end	Night	31% 16% 28% 20% 5%	880
November	1st to 10th	Night	28% 16% 31% 20% 5% 1	918
	11th to 20th	Night	28% 19% 28% 19% 5% 1	950
	21st to end	Night	30% 20% 27% 19% 3 1	950
December	1st to 10th	Night	33% 18% 28% 18% 3	950
	11th to 20th	Night	32% 22% 31% 13% 2	950
	21st to end	Night	30% 20% 28% 19% 4	1045

Page generated at 2026-03-30 03:18:45. Version ac07

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