Quispamsis
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Quispamsis clear sky chart from 2005-11-06 to 2024-11-03.

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% 10% 3 7% 5% 4 4 3 5% 6% 33%	101518
	Night	21% 11% 3 7% 5% 4 4 3 5% 6% 32%	97513
Transparency	Day	52% 4 11% 21% 11% 1	101275
	Night	54% 4 10% 20% 10% 1	97376
Seeing	Day	30% 18% 30% 16% 5% 1	16526
	Night	28% 16% 28% 21% 6%	24287

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% 13% 4 10% 5% 4 4 3 3 5% 35%	2207
	11th to 20th	Day	16% 12% 3 7% 5% 4 3 2 3 3 40%	2441
	21st to end	Day	14% 9% 3 7% 5% 5% 6% 5% 6% 7% 34%	3124
February	1st to 10th	Day	17% 13% 4 7% 5% 5% 5% 3 6% 6% 30%	1710
	11th to 20th	Day	15% 13% 3 9% 5% 5% 4 3 6% 6% 31%	1663
	21st to end	Day	12% 12% 4 8% 6% 4 4 4 5% 6% 36%	1503
March	1st to 10th	Day	23% 15% 4 8% 5% 3 3 3 4 5% 29%	3329
	11th to 20th	Day	16% 17% 4 10% 6% 4 4 3 5% 6% 25%	3480
	21st to end	Day	30% 12% 4 7% 4 4 4 3 5% 4 23%	3816
April	1st to 10th	Day	22% 14% 3 8% 5% 4 3 3 4 5% 28%	2203
	11th to 20th	Day	20% 11% 2 6% 5% 4 3 3 5% 6% 35%	2442
	21st to end	Day	23% 10% 3 7% 4 4 3 3 5% 6% 32%	2470
May	1st to 10th	Day	20% 11% 3 8% 6% 6% 5% 4 5% 6% 27%	4106
	11th to 20th	Day	18% 8% 3 7% 5% 4 5% 3 5% 7% 34%	4334
	21st to end	Day	18% 8% 3 6% 5% 5% 6% 4 6% 8% 30%	4858
June	1st to 10th	Day	24% 10% 3 7% 5% 5% 4 3 4 7% 27%	2850
	11th to 20th	Day	21% 9% 3 7% 5% 4 3 3 5% 6% 34%	2850
	21st to end	Day	29% 8% 2 7% 4 4 3 3 5% 6% 28%	2850
July	1st to 10th	Day	19% 8% 3 8% 5% 5% 5% 4 6% 7% 31%	4760
	11th to 20th	Day	24% 9% 2 6% 4 3 4 4 5% 7% 34%	4760
	21st to end	Day	20% 7% 3 7% 5% 4 4 4 6% 7% 34%	4492
August	1st to 10th	Day	24% 9% 3 7% 4 4 4 3 5% 7% 29%	4105
	11th to 20th	Day	18% 7% 2 6% 4 4 5% 4 6% 8% 35%	4045
	21st to end	Day	13% 6% 2 5% 4 3 4 3 5% 8% 45%	4506
September	1st to 10th	Day	15% 7% 2 6% 4 4 4 3 5% 7% 43%	2277
	11th to 20th	Day	18% 6% 2 5% 3 3 4 3 4 6% 46%	2090
	21st to end	Day	22% 5% 2 4 3 3 3 3 5% 6% 44%	2090
October	1st to 10th	Day	17% 8% 2 7% 5% 4 4 3 5% 6% 39%	1914
	11th to 20th	Day	21% 8% 2 6% 4 4 4 3 4 5% 38%	1900
	21st to end	Day	20% 10% 4 7% 5% 4 4 3 5% 6% 33%	2008
November	1st to 10th	Day	23% 9% 3 6% 5% 4 2 2 4 6% 35%	1609
	11th to 20th	Day	20% 8% 3 6% 4 3 5% 3 5% 7% 36%	1520
	21st to end	Day	21% 12% 4 7% 4 4 5% 4 4 5% 30%	1520
December	1st to 10th	Day	26% 10% 3 8% 4 4 4 4 5% 5% 28%	1520
	11th to 20th	Day	23% 15% 3 9% 5% 4 2 3 4 5% 27%	1735
	21st to end	Day	22% 9% 3 7% 4 4 4 3 4 6% 33%	2431
January	1st to 10th	Night	14% 10% 3 7% 5% 5% 5% 4 5% 6% 37%	4748
	11th to 20th	Night	17% 12% 4 8% 5% 5% 4 3 5% 5% 33%	4503
	21st to end	Night	15% 13% 3 8% 6% 4 4 4 6% 7% 31%	4532
February	1st to 10th	Night	18% 12% 3 7% 5% 4 4 5% 5% 6% 31%	2470
	11th to 20th	Night	16% 12% 4 8% 5% 5% 5% 4 5% 5% 30%	2403
	21st to end	Night	14% 12% 4 8% 6% 4 5% 4 5% 5% 34%	1947
March	1st to 10th	Night	24% 13% 3 7% 4 6% 4 3 4 4 28%	3509
	11th to 20th	Night	18% 16% 5% 10% 5% 5% 4 4 5% 6% 22%	3479
	21st to end	Night	31% 11% 3 6% 4 4 4 3 4 3 26%	3816
April	1st to 10th	Night	23% 12% 3 7% 5% 4 4 3 4 3 29%	1973
	11th to 20th	Night	24% 10% 2 6% 4 4 4 3 5% 5% 33%	1688
	21st to end	Night	24% 9% 3 7% 4 3 4 3 6% 6% 29%	1710
May	1st to 10th	Night	21% 9% 4 9% 5% 5% 5% 5% 5% 6% 27%	2834
	11th to 20th	Night	19% 8% 3 7% 5% 4 4 4 6% 7% 34%	2568
	21st to end	Night	19% 10% 4 9% 5% 5% 4 3 6% 7% 29%	2749
June	1st to 10th	Night	26% 12% 2 7% 4 5% 5% 3 5% 6% 25%	1335
	11th to 20th	Night	22% 10% 3 7% 5% 4 3 3 5% 5% 32%	1330
	21st to end	Night	31% 9% 4 6% 5% 4 5% 2 4 5% 26%	1330
July	1st to 10th	Night	23% 13% 4 9% 5% 4 4 5% 4 5% 24%	2210
	11th to 20th	Night	26% 15% 3 6% 3 4 4 3 5% 6% 25%	2210
	21st to end	Night	21% 9% 2 7% 3 4 5% 4 5% 7% 31%	3011
August	1st to 10th	Night	26% 12% 3 8% 5% 4 4 2 5% 6% 25%	2825
	11th to 20th	Night	18% 11% 2 8% 5% 5% 5% 4 5% 7% 31%	2782
	21st to end	Night	14% 8% 3 5% 4 4 4 3 5% 7% 43%	3149
September	1st to 10th	Night	18% 7% 2 6% 4 4 4 3 6% 7% 40%	1900
	11th to 20th	Night	20% 6% 2 6% 3 3 3 2 5% 6% 43%	2090
	21st to end	Night	22% 6% 2 5% 4 4 3 3 4 7% 41%	2090
October	1st to 10th	Night	21% 6% 3 5% 4 4 3 3 5% 7% 39%	2265
	11th to 20th	Night	18% 9% 3 7% 4 4 4 3 5% 5% 38%	2280
	21st to end	Night	22% 11% 3 7% 4 4 3 4 4 5% 34%	2589
November	1st to 10th	Night	22% 9% 3 6% 4 4 4 3 5% 6% 35%	2513
	11th to 20th	Night	21% 9% 3 7% 4 4 4 4 5% 6% 33%	2660
	21st to end	Night	21% 10% 3 7% 5% 4 4 3 5% 6% 33%	2660
December	1st to 10th	Night	27% 12% 3 7% 4 4 3 3 5% 5% 28%	2660
	11th to 20th	Night	27% 12% 3 7% 5% 3 4 3 4 4 28%	3459
	21st to end	Night	22% 13% 4 8% 5% 4 3 2 4 4 32%	5236

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	53% 3 15% 18% 10% 1	2208
	11th to 20th	Day	50% 4 5% 27% 13% 1	2441
	21st to end	Day	49% 3 13% 19% 15% 1	3124
February	1st to 10th	Day	55% 4 10% 19% 10% 2	1710
	11th to 20th	Day	54% 3 11% 18% 12% 2	1671
	21st to end	Day	49% 5% 9% 24% 10% 3	1503
March	1st to 10th	Day	59% 3 8% 19% 8% 4	3333
	11th to 20th	Day	60% 5% 9% 15% 10% 1	3480
	21st to end	Day	65% 3 4 14% 11% 2	3816
April	1st to 10th	Day	59% 3 8% 15% 12% 3	2203
	11th to 20th	Day	50% 4 8% 23% 14% 1	2442
	21st to end	Day	54% 3 10% 18% 13% 3	2470
May	1st to 10th	Day	59% 5% 8% 21% 7% 1	4120
	11th to 20th	Day	49% 4 15% 23% 8% 1	4338
	21st to end	Day	52% 5% 13% 19% 10%	4858
June	1st to 10th	Day	58% 5% 9% 19% 8% 1	2850
	11th to 20th	Day	51% 4 10% 22% 11% 2	2850
	21st to end	Day	58% 5% 11% 16% 10% 1	2850
July	1st to 10th	Day	52% 6% 13% 19% 10%	4685
	11th to 20th	Day	52% 4 13% 23% 8%	4679
	21st to end	Day	50% 6% 13% 24% 7%	4348
August	1st to 10th	Day	56% 5% 11% 21% 7%	4092
	11th to 20th	Day	46% 6% 15% 25% 8%	4084
	21st to end	Day	37% 5% 15% 26% 17% 1	4506
September	1st to 10th	Day	41% 4 12% 27% 15% 1	2277
	11th to 20th	Day	41% 4 10% 27% 15% 2	2090
	21st to end	Day	43% 4 9% 27% 16% 1	2090
October	1st to 10th	Day	46% 4 9% 28% 13%	1914
	11th to 20th	Day	49% 4 12% 27% 9%	1900
	21st to end	Day	52% 4 11% 20% 13%	2008
November	1st to 10th	Day	53% 4 9% 22% 12% 1	1609
	11th to 20th	Day	48% 5% 13% 19% 14% 1	1520
	21st to end	Day	56% 4 11% 21% 8%	1520
December	1st to 10th	Day	59% 4 9% 20% 7% 1	1520
	11th to 20th	Day	61% 4 8% 16% 10% 1	1735
	21st to end	Day	54% 4 12% 18% 10% 2	2431
January	1st to 10th	Night	48% 3 11% 29% 7% 1	4748
	11th to 20th	Night	55% 4 7% 23% 9% 1	4503
	21st to end	Night	52% 3 9% 24% 11% 1	4532
February	1st to 10th	Night	53% 4 11% 18% 13% 1	2470
	11th to 20th	Night	56% 4 8% 19% 11% 2	2406
	21st to end	Night	52% 5% 8% 20% 12% 3	1947
March	1st to 10th	Night	60% 3 6% 18% 12% 1	3518
	11th to 20th	Night	63% 4 8% 15% 9% 1	3480
	21st to end	Night	64% 3 5% 15% 11% 2	3816
April	1st to 10th	Night	58% 3 7% 15% 12% 4	1973
	11th to 20th	Night	52% 3 9% 21% 14% 1	1688
	21st to end	Night	55% 3 8% 18% 14% 2	1710
May	1st to 10th	Night	58% 5% 13% 17% 7% 1	2840
	11th to 20th	Night	50% 4 15% 23% 7% 1	2569
	21st to end	Night	56% 5% 13% 18% 7% 1	2750
June	1st to 10th	Night	60% 4 9% 18% 7% 1	1335
	11th to 20th	Night	53% 5% 11% 22% 8% 2	1330
	21st to end	Night	62% 4 7% 17% 8% 1	1330
July	1st to 10th	Night	63% 5% 10% 11% 11%	2175
	11th to 20th	Night	62% 5% 8% 18% 7%	2168
	21st to end	Night	51% 6% 13% 19% 10% 1	2915
August	1st to 10th	Night	62% 5% 9% 18% 6%	2813
	11th to 20th	Night	52% 6% 15% 21% 7%	2809
	21st to end	Night	41% 6% 11% 24% 17% 1	3148
September	1st to 10th	Night	44% 3 11% 27% 14% 1	1900
	11th to 20th	Night	44% 3 11% 25% 16% 1	2090
	21st to end	Night	45% 4 8% 27% 14% 2	2090
October	1st to 10th	Night	45% 4 10% 25% 15% 1	2265
	11th to 20th	Night	47% 4 11% 26% 11% 1	2280
	21st to end	Night	53% 4 10% 20% 13% 1	2589
November	1st to 10th	Night	50% 4 12% 21% 12% 1	2513
	11th to 20th	Night	52% 4 10% 20% 13% 1	2660
	21st to end	Night	52% 5% 13% 19% 10% 1	2660
December	1st to 10th	Night	60% 4 9% 19% 8%	2660
	11th to 20th	Night	61% 3 7% 19% 9%	3460
	21st to end	Night	57% 3 10% 19% 7% 4	5236

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% 31% 12% 1	180
	11th to 20th	Day	39% 21% 31% 8% 2	180
	21st to end	Day	22% 25% 35% 15% 4	407
February	1st to 10th	Day	31% 25% 27% 14% 4	370
	11th to 20th	Day	28% 31% 27% 12% 2 1	366
	21st to end	Day	25% 29% 30% 14% 1	350
March	1st to 10th	Day	30% 25% 33% 10% 2	460
	11th to 20th	Day	28% 25% 30% 13% 3 1	460
	21st to end	Day	37% 21% 28% 9% 4 1	506
April	1st to 10th	Day	38% 30% 21% 8% 3	460
	11th to 20th	Day	34% 24% 27% 11% 4	452
	21st to end	Day	33% 22% 28% 12% 5% 1	460
May	1st to 10th	Day	35% 20% 31% 11% 3	463
	11th to 20th	Day	28% 17% 29% 20% 5% 1	636
	21st to end	Day	32% 18% 29% 17% 4 1	735
June	1st to 10th	Day	33% 17% 27% 17% 5%	680
	11th to 20th	Day	28% 15% 29% 21% 6% 1	680
	21st to end	Day	35% 12% 27% 19% 7% 1	680
July	1st to 10th	Day	30% 10% 32% 21% 7% 1	670
	11th to 20th	Day	29% 8% 31% 23% 8% 2	668
	21st to end	Day	27% 13% 36% 18% 6% 1	547
August	1st to 10th	Day	24% 11% 33% 26% 6% 1	486
	11th to 20th	Day	27% 9% 35% 21% 7% 1	479
	21st to end	Day	23% 13% 29% 25% 8% 2	539
September	1st to 10th	Day	18% 14% 40% 20% 6% 2	490
	11th to 20th	Day	27% 13% 29% 20% 8% 3	490
	21st to end	Day	24% 16% 33% 19% 6% 2	490
October	1st to 10th	Day	24% 16% 27% 21% 11% 2	397
	11th to 20th	Day	25% 18% 30% 18% 7% 2	390
	21st to end	Day	27% 21% 33% 15% 3 1	429
November	1st to 10th	Day	30% 19% 31% 14% 5% 2	371
	11th to 20th	Day	29% 23% 27% 16% 5%	370
	21st to end	Day	35% 25% 28% 8% 3 1	370
December	1st to 10th	Day	36% 20% 28% 13% 3	370
	11th to 20th	Day	37% 28% 24% 9% 2	247
	21st to end	Day	34% 29% 25% 11% 1 1	198
January	1st to 10th	Night	28% 23% 27% 18% 4	850
	11th to 20th	Night	31% 21% 27% 17% 4	778
	21st to end	Night	21% 26% 33% 16% 4	836
February	1st to 10th	Night	29% 22% 28% 18% 2	760
	11th to 20th	Night	26% 26% 29% 17% 2	743
	21st to end	Night	24% 22% 29% 22% 3 1	628
March	1st to 10th	Night	26% 21% 35% 17% 2	760
	11th to 20th	Night	26% 18% 31% 21% 4	760
	21st to end	Night	27% 19% 30% 17% 6% 1	836
April	1st to 10th	Night	32% 19% 30% 17% 3	655
	11th to 20th	Night	30% 15% 33% 17% 5%	564
	21st to end	Night	29% 16% 29% 21% 5%	570
May	1st to 10th	Night	29% 12% 31% 22% 5% 1	570
	11th to 20th	Night	30% 11% 32% 21% 5%	562
	21st to end	Night	28% 13% 34% 19% 4	616
June	1st to 10th	Night	36% 6% 26% 26% 5%	385
	11th to 20th	Night	28% 8% 28% 31% 5%	380
	21st to end	Night	36% 5% 23% 29% 7% 1	380
July	1st to 10th	Night	29% 6% 26% 31% 8%	370
	11th to 20th	Night	32% 5% 23% 31% 9% 1	368
	21st to end	Night	28% 5% 28% 30% 8%	591
August	1st to 10th	Night	23% 5% 29% 33% 10% 1	568
	11th to 20th	Night	29% 7% 24% 30% 10%	562
	21st to end	Night	23% 7% 26% 30% 14% 1	627
September	1st to 10th	Night	23% 7% 32% 28% 9% 1	570
	11th to 20th	Night	25% 9% 23% 27% 14% 1	760
	21st to end	Night	26% 10% 27% 24% 11% 1	760
October	1st to 10th	Night	26% 8% 25% 28% 11% 2	760
	11th to 20th	Night	24% 16% 29% 21% 10% 1	760
	21st to end	Night	30% 18% 27% 22% 3	836
November	1st to 10th	Night	29% 17% 26% 19% 8% 1	787
	11th to 20th	Night	28% 21% 25% 20% 6% 1	850
	21st to end	Night	30% 21% 24% 19% 5%	850
December	1st to 10th	Night	34% 20% 28% 16% 3	850
	11th to 20th	Night	33% 25% 27% 12% 2	850
	21st to end	Night	32% 24% 24% 16% 4	935

Page generated at 2024-10-31 04:39:21. Version ac07

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