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 2024-01-16.

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	21% 10% 4 7% 5% 3 4 4 5% 6% 30%	74999
	Night	21% 10% 4 7% 6% 3 4 4 5% 6% 29%	74794
Transparency	Day	53% 8% 12% 18% 8% 1	74699
	Night	55% 8% 12% 17% 8% 1	74629
Seeing	Day	25% 11% 28% 26% 9% 1	15942
	Night	25% 14% 30% 24% 7%	23558

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	17% 17% 5% 9% 5% 4 5% 5% 4 6% 22%	1362
	11th to 20th	Day	22% 17% 5% 9% 7% 3 3 4 4 6% 20%	1531
	21st to end	Day	14% 11% 5% 8% 7% 3 5% 6% 5% 7% 29%	1782
February	1st to 10th	Day	20% 11% 5% 10% 7% 3 5% 5% 5% 6% 23%	1620
	11th to 20th	Day	19% 15% 5% 10% 6% 3 4 4 5% 6% 24%	1573
	21st to end	Day	12% 13% 6% 9% 6% 3 4 4 5% 9% 30%	1339
March	1st to 10th	Day	15% 13% 7% 11% 7% 4 4 5% 5% 4 25%	1976
	11th to 20th	Day	15% 11% 7% 10% 7% 3 4 4 4 6% 30%	1980
	21st to end	Day	19% 14% 6% 8% 5% 3 3 4 4 5% 30%	2178
April	1st to 10th	Day	24% 13% 5% 7% 5% 4 4 3 4 5% 24%	2142
	11th to 20th	Day	20% 9% 4 6% 6% 3 5% 4 4 6% 32%	2228
	21st to end	Day	24% 12% 3 7% 5% 3 4 5% 4 7% 27%	2340
May	1st to 10th	Day	23% 14% 4 6% 6% 3 4 4 5% 6% 24%	2394
	11th to 20th	Day	24% 9% 3 6% 5% 2 4 4 5% 5% 33%	2478
	21st to end	Day	22% 9% 5% 6% 5% 3 4 3 5% 8% 31%	2724
June	1st to 10th	Day	27% 9% 3 6% 5% 3 4 5% 5% 6% 25%	2551
	11th to 20th	Day	23% 8% 3 6% 5% 2 5% 5% 6% 6% 31%	2700
	21st to end	Day	28% 9% 3 6% 5% 3 5% 4 4 6% 28%	2700
July	1st to 10th	Day	20% 8% 2 5% 5% 3 4 5% 5% 8% 35%	2700
	11th to 20th	Day	20% 7% 3 5% 4 3 5% 5% 6% 8% 35%	2565
	21st to end	Day	23% 8% 4 6% 5% 2 4 5% 6% 8% 29%	2670
August	1st to 10th	Day	16% 6% 3 5% 5% 3 6% 6% 6% 8% 36%	2327
	11th to 20th	Day	19% 7% 3 7% 6% 4 5% 5% 7% 7% 32%	2304
	21st to end	Day	15% 7% 2 5% 5% 2 4 4 5% 7% 43%	2498
September	1st to 10th	Day	17% 5% 3 6% 5% 3 4 5% 4 7% 41%	2160
	11th to 20th	Day	19% 7% 3 5% 5% 3 4 3 4 6% 40%	2075
	21st to end	Day	19% 7% 3 5% 4 2 4 3 5% 7% 43%	1935
October	1st to 10th	Day	18% 8% 3 6% 6% 2 5% 4 5% 7% 38%	1800
	11th to 20th	Day	22% 9% 2 5% 5% 3 5% 5% 5% 7% 33%	1800
	21st to end	Day	21% 11% 4 6% 6% 3 5% 3 4 5% 32%	1980
November	1st to 10th	Day	23% 11% 3 7% 6% 3 5% 3 4 5% 29%	1512
	11th to 20th	Day	22% 13% 4 6% 6% 3 4 4 4 5% 31%	1520
	21st to end	Day	22% 13% 5% 7% 6% 3 4 4 4 4 28%	1520
December	1st to 10th	Day	26% 14% 4 8% 6% 3 3 4 3 5% 23%	1520
	11th to 20th	Day	27% 15% 5% 8% 6% 3 4 3 3 4 23%	1906
	21st to end	Day	21% 13% 7% 12% 6% 3 4 4 4 6% 20%	2609
January	1st to 10th	Night	19% 16% 5% 8% 6% 3 5% 4 5% 6% 23%	2795
	11th to 20th	Night	21% 14% 5% 9% 6% 3 4 5% 5% 7% 22%	2547
	21st to end	Night	15% 11% 4 8% 6% 3 4 5% 5% 8% 28%	2574
February	1st to 10th	Night	19% 12% 4 8% 6% 4 5% 4 6% 6% 24%	2340
	11th to 20th	Night	19% 12% 5% 10% 7% 3 5% 4 4 6% 25%	2273
	21st to end	Night	13% 13% 6% 8% 7% 4 6% 4 4 6% 30%	1916
March	1st to 10th	Night	16% 12% 6% 9% 7% 3 5% 4 4 4 30%	1971
	11th to 20th	Night	19% 10% 5% 7% 6% 4 5% 5% 5% 6% 27%	1979
	21st to end	Night	19% 11% 4 8% 6% 3 4 3 4 6% 32%	2178
April	1st to 10th	Night	25% 13% 4 7% 6% 3 4 3 5% 4 26%	1818
	11th to 20th	Night	22% 10% 4 6% 6% 3 5% 5% 4 6% 30%	1680
	21st to end	Night	25% 11% 3 6% 5% 3 4 4 5% 5% 30%	1620
May	1st to 10th	Night	25% 10% 4 6% 7% 3 4 4 4 6% 27%	1566
	11th to 20th	Night	25% 9% 2 5% 5% 3 4 4 5% 6% 31%	1416
	21st to end	Night	19% 9% 5% 7% 5% 3 5% 4 5% 6% 31%	1550
June	1st to 10th	Night	25% 10% 4 7% 5% 4 4 5% 5% 7% 25%	1422
	11th to 20th	Night	24% 7% 3 7% 5% 3 4 3 4 5% 35%	1260
	21st to end	Night	25% 8% 4 7% 7% 4 5% 4 5% 6% 24%	1260
July	1st to 10th	Night	18% 8% 4 7% 5% 4 6% 6% 7% 9% 26%	1260
	11th to 20th	Night	18% 9% 2 8% 5% 3 5% 6% 7% 8% 29%	1376
	21st to end	Night	19% 9% 4 7% 6% 4 6% 5% 6% 9% 25%	1645
August	1st to 10th	Night	17% 6% 3 6% 5% 4 5% 4 6% 8% 35%	1612
	11th to 20th	Night	19% 11% 3 8% 5% 3 4 6% 6% 8% 26%	1596
	21st to end	Night	15% 7% 2 6% 5% 4 5% 4 5% 8% 38%	1858
September	1st to 10th	Night	15% 7% 3 6% 5% 3 5% 4 5% 8% 39%	1800
	11th to 20th	Night	19% 6% 3 5% 4 2 3 3 5% 7% 43%	1882
	21st to end	Night	20% 6% 3 5% 4 3 3 4 4 7% 40%	2024
October	1st to 10th	Night	19% 6% 3 6% 5% 3 4 4 5% 6% 39%	2160
	11th to 20th	Night	20% 8% 3 6% 5% 3 3 4 5% 6% 36%	2160
	21st to end	Night	27% 9% 2 5% 5% 3 4 4 4 5% 31%	2376
November	1st to 10th	Night	24% 8% 3 6% 5% 3 4 4 5% 7% 32%	2562
	11th to 20th	Night	22% 10% 5% 7% 6% 3 5% 5% 6% 5% 28%	2660
	21st to end	Night	23% 11% 4 7% 5% 3 4 4 5% 6% 27%	2660
December	1st to 10th	Night	27% 13% 4 6% 6% 3 4 4 5% 6% 23%	2660
	11th to 20th	Night	29% 13% 4 7% 6% 2 4 3 4 5% 23%	3293
	21st to end	Night	25% 13% 6% 11% 6% 2 4 3 3 4 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	63% 9% 13% 10% 6% 1	1363
	11th to 20th	Day	66% 7% 10% 13% 4	1531
	21st to end	Day	54% 9% 11% 16% 9%	1782
February	1st to 10th	Day	62% 6% 10% 12% 8% 1	1620
	11th to 20th	Day	62% 8% 11% 11% 7% 1	1581
	21st to end	Day	51% 6% 13% 18% 10% 2	1339
March	1st to 10th	Day	59% 7% 9% 15% 8% 1	1980
	11th to 20th	Day	55% 6% 11% 16% 10% 2	1980
	21st to end	Day	56% 6% 8% 17% 10% 2	2178
April	1st to 10th	Day	61% 5% 8% 13% 10% 2	2142
	11th to 20th	Day	52% 6% 9% 20% 13% 1	2228
	21st to end	Day	57% 6% 11% 17% 9% 2	2340
May	1st to 10th	Day	59% 7% 9% 16% 9% 1	2394
	11th to 20th	Day	51% 7% 9% 22% 10%	2482
	21st to end	Day	53% 8% 12% 20% 7% 1	2724
June	1st to 10th	Day	58% 8% 12% 17% 5%	2551
	11th to 20th	Day	51% 9% 12% 19% 8% 1	2700
	21st to end	Day	57% 8% 10% 16% 9% 1	2700
July	1st to 10th	Day	44% 9% 15% 21% 10%	2625
	11th to 20th	Day	45% 9% 15% 21% 9%	2486
	21st to end	Day	51% 9% 14% 20% 5%	2521
August	1st to 10th	Day	42% 11% 15% 23% 8%	2314
	11th to 20th	Day	47% 10% 15% 22% 6%	2304
	21st to end	Day	38% 7% 17% 27% 11%	2498
September	1st to 10th	Day	41% 8% 14% 24% 12% 1	2160
	11th to 20th	Day	44% 6% 12% 23% 13% 2	2075
	21st to end	Day	42% 5% 11% 27% 14% 1	1935
October	1st to 10th	Day	45% 6% 11% 27% 10%	1800
	11th to 20th	Day	49% 9% 12% 23% 7% 1	1800
	21st to end	Day	55% 6% 11% 19% 9%	1980
November	1st to 10th	Day	56% 7% 10% 19% 8% 1	1512
	11th to 20th	Day	56% 6% 15% 16% 7% 1	1520
	21st to end	Day	61% 7% 12% 14% 6%	1520
December	1st to 10th	Day	64% 8% 10% 13% 5%	1520
	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	63% 9% 12% 12% 4	2795
	11th to 20th	Night	62% 8% 12% 13% 5% 1	2547
	21st to end	Night	55% 10% 12% 17% 6% 1	2574
February	1st to 10th	Night	61% 7% 11% 12% 8% 1	2340
	11th to 20th	Night	60% 8% 11% 13% 7% 1	2276
	21st to end	Night	55% 5% 11% 16% 10% 1	1916
March	1st to 10th	Night	57% 7% 8% 16% 11% 1	1980
	11th to 20th	Night	55% 8% 11% 14% 11% 2	1980
	21st to end	Night	55% 5% 10% 18% 11% 2	2178
April	1st to 10th	Night	61% 6% 8% 12% 10% 3	1818
	11th to 20th	Night	54% 6% 9% 18% 12% 1	1680
	21st to end	Night	55% 7% 11% 15% 11% 1	1620
May	1st to 10th	Night	57% 7% 10% 16% 9% 1	1566
	11th to 20th	Night	52% 7% 9% 23% 8% 1	1417
	21st to end	Night	52% 8% 13% 18% 8% 1	1551
June	1st to 10th	Night	59% 8% 10% 18% 5%	1422
	11th to 20th	Night	52% 6% 10% 22% 8% 2	1260
	21st to end	Night	59% 8% 11% 14% 7% 1	1260
July	1st to 10th	Night	47% 13% 16% 17% 7%	1225
	11th to 20th	Night	49% 10% 13% 20% 8%	1332
	21st to end	Night	54% 10% 14% 15% 7%	1554
August	1st to 10th	Night	45% 9% 15% 24% 7%	1600
	11th to 20th	Night	52% 10% 16% 17% 5%	1596
	21st to end	Night	41% 8% 17% 25% 8%	1858
September	1st to 10th	Night	42% 9% 12% 27% 11% 1	1800
	11th to 20th	Night	41% 6% 13% 26% 12% 1	1882
	21st to end	Night	43% 7% 12% 26% 12% 1	2024
October	1st to 10th	Night	44% 8% 12% 24% 12%	2160
	11th to 20th	Night	48% 7% 14% 24% 7%	2160
	21st to end	Night	56% 6% 10% 17% 9%	2376
November	1st to 10th	Night	52% 9% 13% 17% 8% 1	2562
	11th to 20th	Night	56% 8% 13% 15% 8%	2660
	21st to end	Night	58% 9% 14% 14% 4	2660
December	1st to 10th	Night	63% 8% 10% 15% 4	2660
	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% 17% 34% 14% 4 1	356
	21st to end	Day	22% 11% 40% 22% 4	374
February	1st to 10th	Day	28% 15% 34% 21% 2	340
	11th to 20th	Day	25% 21% 35% 16% 3	336
	21st to end	Day	21% 17% 35% 23% 4	282
March	1st to 10th	Day	22% 20% 36% 19% 4	420
	11th to 20th	Day	19% 20% 33% 22% 6%	420
	21st to end	Day	26% 15% 33% 20% 6%	462
April	1st to 10th	Day	33% 18% 31% 15% 3	420
	11th to 20th	Day	23% 13% 35% 20% 7%	412
	21st to end	Day	26% 10% 27% 27% 8% 1	420
May	1st to 10th	Day	31% 10% 30% 22% 5% 1	477
	11th to 20th	Day	25% 7% 32% 27% 8% 1	624
	21st to end	Day	28% 8% 28% 29% 7% 1	680
June	1st to 10th	Day	30% 7% 26% 27% 9%	630
	11th to 20th	Day	25% 7% 25% 33% 10% 1	630
	21st to end	Day	30% 6% 20% 32% 10% 3	630
July	1st to 10th	Day	23% 3 25% 35% 14% 1	620
	11th to 20th	Day	22% 4 22% 34% 17% 1	618
	21st to end	Day	23% 5% 21% 35% 15% 1	610
August	1st to 10th	Day	16% 2 21% 41% 19% 1	446
	11th to 20th	Day	22% 6% 22% 33% 14% 3	439
	21st to end	Day	18% 7% 22% 32% 19% 2	495
September	1st to 10th	Day	15% 5% 28% 35% 15% 1	450
	11th to 20th	Day	20% 8% 26% 29% 14% 2	450
	21st to end	Day	21% 8% 27% 26% 15% 2	427
October	1st to 10th	Day	21% 10% 24% 28% 14% 3	360
	11th to 20th	Day	23% 13% 27% 26% 11% 1	360
	21st to end	Day	26% 14% 31% 21% 6% 1	396
November	1st to 10th	Day	27% 16% 27% 22% 8% 1	365
	11th to 20th	Day	27% 20% 30% 17% 6%	370
	21st to end	Day	29% 19% 35% 15% 2	370
December	1st to 10th	Day	35% 16% 28% 19% 2	370
	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	29% 19% 29% 19% 4	805
	21st to end	Night	21% 21% 34% 18% 5%	792
February	1st to 10th	Night	26% 21% 34% 17% 3	720
	11th to 20th	Night	27% 23% 32% 15% 3 1	703
	21st to end	Night	19% 16% 38% 21% 5% 1	592
March	1st to 10th	Night	23% 17% 36% 21% 3	720
	11th to 20th	Night	23% 16% 31% 24% 7%	720
	21st to end	Night	24% 14% 34% 21% 7%	792
April	1st to 10th	Night	30% 14% 32% 20% 4	558
	11th to 20th	Night	27% 13% 32% 22% 5%	534
	21st to end	Night	32% 10% 31% 21% 6% 1	540
May	1st to 10th	Night	29% 9% 29% 25% 6% 1	540
	11th to 20th	Night	28% 9% 26% 29% 8%	532
	21st to end	Night	21% 8% 36% 29% 5%	583
June	1st to 10th	Night	27% 8% 28% 29% 8% 1	522
	11th to 20th	Night	25% 6% 28% 33% 7%	360
	21st to end	Night	26% 5% 24% 34% 10% 1	360
July	1st to 10th	Night	23% 5% 21% 42% 9%	350
	11th to 20th	Night	18% 7% 25% 39% 11%	462
	21st to end	Night	21% 6% 22% 41% 10%	590
August	1st to 10th	Night	19% 3 24% 40% 13% 1	538
	11th to 20th	Night	21% 4 27% 34% 12% 1	532
	21st to end	Night	18% 6% 23% 37% 16% 1	594
September	1st to 10th	Night	16% 6% 31% 35% 11% 1	540
	11th to 20th	Night	21% 8% 25% 34% 12% 1	622
	21st to end	Night	21% 9% 30% 27% 11% 1	720
October	1st to 10th	Night	22% 8% 28% 30% 11% 1	720
	11th to 20th	Night	23% 11% 34% 21% 9% 1	720
	21st to end	Night	31% 15% 28% 20% 5%	792
November	1st to 10th	Night	27% 15% 31% 22% 5% 1	820
	11th to 20th	Night	25% 20% 29% 20% 6% 1	850
	21st to end	Night	28% 20% 28% 20% 4	850
December	1st to 10th	Night	34% 18% 29% 17% 3	850
	11th to 20th	Night	30% 22% 32% 13% 2	850
	21st to end	Night	29% 19% 28% 19% 4	935

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