Palgrave Conservation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Palgrave Conservation Area clear sky chart from 2005-11-06 to 2024-04-03.

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	15% 11% 4 8% 7% 4 5% 5% 5% 7% 30%	79186
	Night	14% 10% 5% 8% 7% 4 5% 5% 5% 6% 31%	80924
Transparency	Day	52% 7% 12% 18% 10% 1	78900
	Night	52% 8% 11% 18% 9% 1	80745
Seeing	Day	21% 18% 31% 18% 8% 3	13937
	Night	20% 17% 31% 22% 9% 1	23148

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% 6% 11% 8% 4 5% 5% 5% 4 22%	2517
	11th to 20th	Day	11% 20% 7% 15% 13% 6% 4 3 4 5% 12%	2780
	21st to end	Day	20% 21% 8% 11% 6% 4 4 4 3 5% 15%	3124
February	1st to 10th	Day	13% 16% 5% 12% 9% 5% 7% 6% 4 4 18%	1710
	11th to 20th	Day	11% 14% 8% 13% 9% 4 5% 4 6% 6% 21%	1663
	21st to end	Day	16% 16% 6% 10% 6% 3 5% 4 5% 5% 24%	1470
March	1st to 10th	Day	13% 12% 6% 10% 8% 4 5% 4 5% 5% 29%	2085
	11th to 20th	Day	12% 13% 7% 9% 8% 3 6% 4 4 4 31%	2090
	21st to end	Day	17% 13% 4 7% 6% 3 4 4 5% 4 32%	2299
April	1st to 10th	Day	15% 14% 5% 8% 6% 3 4 5% 6% 6% 28%	2132
	11th to 20th	Day	18% 11% 4 6% 5% 3 4 4 4 7% 36%	2230
	21st to end	Day	20% 10% 4 7% 5% 3 3 4 5% 7% 33%	2340
May	1st to 10th	Day	16% 9% 4 7% 5% 3 5% 5% 4 8% 34%	2340
	11th to 20th	Day	15% 7% 4 6% 5% 3 5% 5% 5% 7% 39%	2446
	21st to end	Day	12% 4 2 5% 6% 4 5% 6% 6% 8% 42%	2725
June	1st to 10th	Day	15% 6% 3 5% 5% 3 5% 6% 6% 9% 37%	2520
	11th to 20th	Day	12% 6% 2 5% 4 3 5% 5% 6% 9% 41%	2594
	21st to end	Day	14% 5% 2 5% 5% 4 5% 5% 6% 9% 40%	2700
July	1st to 10th	Day	9% 4 2 5% 5% 3 6% 6% 5% 9% 44%	2657
	11th to 20th	Day	11% 6% 3 5% 6% 4 6% 6% 7% 9% 38%	2520
	21st to end	Day	11% 6% 3 6% 7% 4 7% 6% 7% 9% 34%	2555
August	1st to 10th	Day	9% 5% 2 6% 7% 3 6% 6% 8% 10% 38%	2327
	11th to 20th	Day	8% 6% 3 7% 8% 4 7% 6% 7% 10% 35%	2303
	21st to end	Day	13% 6% 3 5% 5% 3 6% 5% 7% 8% 37%	2498
September	1st to 10th	Day	13% 7% 3 6% 6% 4 6% 5% 5% 8% 38%	2160
	11th to 20th	Day	12% 5% 3 6% 6% 3 5% 5% 5% 8% 41%	2030
	21st to end	Day	14% 7% 3 7% 8% 4 6% 4 6% 8% 34%	1958
October	1st to 10th	Day	19% 9% 4 7% 6% 4 5% 4 5% 6% 32%	1800
	11th to 20th	Day	20% 11% 5% 8% 7% 3 5% 4 4 6% 26%	1800
	21st to end	Day	26% 15% 5% 7% 6% 3 3 4 4 6% 21%	1980
November	1st to 10th	Day	12% 13% 4 8% 6% 3 6% 5% 6% 9% 28%	1595
	11th to 20th	Day	13% 13% 5% 10% 8% 4 5% 5% 6% 7% 23%	1520
	21st to end	Day	16% 17% 7% 10% 8% 3 5% 6% 5% 6% 18%	1520
December	1st to 10th	Day	15% 18% 8% 12% 9% 5% 5% 4 4 6% 13%	1520
	11th to 20th	Day	17% 16% 7% 11% 8% 4 6% 4 5% 6% 17%	1906
	21st to end	Day	25% 19% 8% 15% 6% 3 4 4 3 3 9%	2772
January	1st to 10th	Night	15% 15% 7% 11% 8% 5% 5% 5% 4 5% 19%	4429
	11th to 20th	Night	12% 13% 8% 13% 13% 6% 8% 5% 4 5% 12%	4176
	21st to end	Night	18% 13% 8% 10% 11% 4 6% 5% 5% 5% 15%	4532
February	1st to 10th	Night	13% 14% 6% 10% 10% 4 4 5% 5% 6% 23%	2470
	11th to 20th	Night	11% 13% 6% 10% 9% 5% 7% 5% 5% 6% 24%	2403
	21st to end	Night	11% 12% 5% 10% 7% 5% 5% 5% 5% 6% 27%	1982
March	1st to 10th	Night	12% 10% 5% 9% 7% 4 5% 5% 4 6% 32%	2080
	11th to 20th	Night	13% 11% 5% 8% 6% 3 5% 4 4 6% 34%	2089
	21st to end	Night	15% 9% 4 6% 6% 3 5% 4 5% 5% 39%	2299
April	1st to 10th	Night	17% 11% 4 7% 6% 3 6% 4 5% 6% 31%	1872
	11th to 20th	Night	16% 8% 3 4 6% 3 5% 5% 5% 7% 38%	1696
	21st to end	Night	15% 11% 4 6% 5% 3 5% 5% 6% 6% 35%	1620
May	1st to 10th	Night	16% 6% 3 6% 4 3 5% 5% 5% 8% 39%	1620
	11th to 20th	Night	15% 5% 3 4 5% 2 4 4 5% 7% 47%	1447
	21st to end	Night	9% 4 2 4 4 2 5% 4 5% 8% 52%	1550
June	1st to 10th	Night	13% 5% 2 4 5% 4 6% 5% 6% 9% 42%	1440
	11th to 20th	Night	10% 4 2 6% 5% 3 5% 6% 7% 9% 44%	1359
	21st to end	Night	12% 4 2 5% 4 2 5% 4 5% 8% 48%	1260
July	1st to 10th	Night	5% 3 3 4 4 3 4 4 4 7% 58%	1296
	11th to 20th	Night	8% 4 3 4 6% 2 6% 4 5% 7% 50%	1440
	21st to end	Night	7% 5% 2 3 4 3 5% 5% 6% 8% 51%	1760
August	1st to 10th	Night	7% 6% 2 4 4 3 4 5% 6% 8% 51%	1611
	11th to 20th	Night	6% 5% 3 5% 4 2 5% 6% 7% 9% 50%	1598
	21st to end	Night	11% 6% 2 5% 5% 2 4 5% 6% 7% 48%	1840
September	1st to 10th	Night	9% 5% 2 6% 5% 3 4 5% 7% 7% 48%	1800
	11th to 20th	Night	11% 4 2 4 3 2 3 5% 5% 7% 53%	1926
	21st to end	Night	15% 7% 3 5% 6% 3 4 4 5% 6% 42%	2002
October	1st to 10th	Night	18% 6% 3 6% 6% 4 3 5% 6% 7% 36%	2160
	11th to 20th	Night	18% 10% 3 6% 6% 3 5% 6% 6% 5% 33%	2160
	21st to end	Night	21% 11% 4 7% 6% 3 5% 6% 5% 7% 25%	2376
November	1st to 10th	Night	15% 9% 4 6% 6% 3 5% 5% 6% 6% 35%	2479
	11th to 20th	Night	15% 11% 4 9% 6% 3 6% 5% 6% 7% 27%	2660
	21st to end	Night	16% 13% 6% 9% 7% 3 5% 5% 5% 7% 23%	2660
December	1st to 10th	Night	19% 14% 5% 9% 7% 4 6% 6% 6% 7% 18%	2660
	11th to 20th	Night	14% 17% 7% 12% 7% 3 5% 6% 5% 6% 18%	3288
	21st to end	Night	26% 19% 7% 14% 6% 4 4 4 4 4 10%	4884

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	62% 9% 14% 11% 5%	2518
	11th to 20th	Day	73% 8% 8% 8% 3	2780
	21st to end	Day	72% 7% 9% 8% 4 1	3124
February	1st to 10th	Day	68% 7% 7% 14% 3 1	1710
	11th to 20th	Day	61% 8% 11% 13% 6% 1	1672
	21st to end	Day	62% 7% 8% 14% 8% 1	1470
March	1st to 10th	Day	57% 7% 11% 15% 9% 1	2088
	11th to 20th	Day	55% 7% 7% 17% 11% 2	2090
	21st to end	Day	55% 5% 9% 15% 13% 2	2299
April	1st to 10th	Day	56% 6% 10% 17% 10% 1	2132
	11th to 20th	Day	49% 5% 10% 21% 15% 1	2230
	21st to end	Day	52% 5% 11% 18% 11% 2	2340
May	1st to 10th	Day	49% 6% 10% 21% 13% 1	2340
	11th to 20th	Day	45% 6% 10% 24% 13% 1	2450
	21st to end	Day	39% 8% 15% 22% 14% 2	2725
June	1st to 10th	Day	42% 8% 12% 21% 15% 1	2520
	11th to 20th	Day	38% 7% 14% 24% 16% 1	2594
	21st to end	Day	40% 7% 15% 24% 14% 1	2700
July	1st to 10th	Day	35% 8% 13% 23% 18% 2	2585
	11th to 20th	Day	39% 8% 14% 28% 11% 1	2445
	21st to end	Day	42% 9% 14% 21% 12% 2	2412
August	1st to 10th	Day	39% 9% 17% 23% 11% 2	2314
	11th to 20th	Day	42% 8% 17% 23% 11%	2303
	21st to end	Day	42% 8% 14% 24% 11% 1	2498
September	1st to 10th	Day	43% 8% 13% 24% 10% 2	2160
	11th to 20th	Day	40% 6% 13% 28% 12%	2030
	21st to end	Day	48% 7% 13% 24% 8% 1	1958
October	1st to 10th	Day	52% 7% 12% 18% 10% 1	1800
	11th to 20th	Day	57% 7% 12% 17% 6% 1	1800
	21st to end	Day	65% 6% 12% 11% 5%	1980
November	1st to 10th	Day	51% 9% 13% 19% 8% 1	1595
	11th to 20th	Day	58% 8% 13% 13% 7%	1520
	21st to end	Day	65% 9% 12% 11% 3	1520
December	1st to 10th	Day	72% 7% 11% 8% 2	1520
	11th to 20th	Day	66% 9% 13% 9% 3	1906
	21st to end	Day	80% 5% 6% 7% 1	2772
January	1st to 10th	Night	63% 10% 11% 12% 4	4429
	11th to 20th	Night	71% 10% 8% 8% 3	4176
	21st to end	Night	66% 11% 10% 9% 3 1	4532
February	1st to 10th	Night	59% 8% 10% 18% 5%	2470
	11th to 20th	Night	59% 7% 10% 16% 7%	2405
	21st to end	Night	54% 8% 13% 16% 8% 1	1982
March	1st to 10th	Night	52% 7% 12% 18% 9% 1	2090
	11th to 20th	Night	51% 6% 10% 20% 11% 2	2090
	21st to end	Night	47% 5% 10% 21% 15% 2	2299
April	1st to 10th	Night	54% 5% 10% 18% 13% 1	1872
	11th to 20th	Night	45% 6% 10% 21% 16% 2	1696
	21st to end	Night	48% 5% 12% 18% 15% 2	1620
May	1st to 10th	Night	43% 6% 10% 22% 16% 2	1620
	11th to 20th	Night	38% 6% 10% 27% 17% 3	1448
	21st to end	Night	30% 7% 16% 25% 17% 4	1551
June	1st to 10th	Night	38% 7% 11% 24% 18% 2	1440
	11th to 20th	Night	35% 8% 12% 24% 20% 2	1359
	21st to end	Night	34% 8% 13% 28% 16% 1	1260
July	1st to 10th	Night	26% 8% 11% 28% 24% 3	1259
	11th to 20th	Night	32% 6% 12% 33% 16% 1	1392
	21st to end	Night	29% 8% 15% 30% 15% 3	1662
August	1st to 10th	Night	30% 7% 17% 31% 14% 1	1600
	11th to 20th	Night	28% 9% 14% 32% 15% 1	1598
	21st to end	Night	34% 8% 13% 29% 16% 1	1840
September	1st to 10th	Night	33% 9% 16% 28% 13% 1	1800
	11th to 20th	Night	30% 6% 12% 35% 17%	1926
	21st to end	Night	43% 6% 13% 27% 10% 1	2002
October	1st to 10th	Night	47% 8% 10% 20% 14% 1	2160
	11th to 20th	Night	51% 8% 12% 21% 7%	2160
	21st to end	Night	57% 9% 10% 15% 9%	2376
November	1st to 10th	Night	47% 8% 12% 22% 10% 1	2479
	11th to 20th	Night	53% 8% 14% 15% 8% 1	2660
	21st to end	Night	58% 11% 15% 13% 2 1	2660
December	1st to 10th	Night	63% 10% 12% 12% 3	2660
	11th to 20th	Night	64% 9% 12% 11% 3	3288
	21st to end	Night	76% 9% 7% 6% 2	4884

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% 24% 34% 14% 3 1	180
	11th to 20th	Day	25% 30% 30% 11% 4 1	254
	21st to end	Day	28% 25% 32% 12% 2	297
February	1st to 10th	Day	32% 31% 24% 9% 3	270
	11th to 20th	Day	27% 33% 34% 5% 1	270
	21st to end	Day	37% 33% 24% 5%	225
March	1st to 10th	Day	23% 27% 32% 14% 4	458
	11th to 20th	Day	24% 22% 37% 12% 4	460
	21st to end	Day	31% 22% 30% 12% 5% 1	506
April	1st to 10th	Day	24% 26% 32% 11% 6%	428
	11th to 20th	Day	31% 21% 25% 12% 8% 3	412
	21st to end	Day	26% 21% 32% 14% 5% 2	420
May	1st to 10th	Day	22% 18% 30% 19% 7% 3	423
	11th to 20th	Day	21% 18% 31% 19% 8% 4	447
	21st to end	Day	15% 17% 28% 26% 10% 4	485
June	1st to 10th	Day	16% 16% 36% 22% 8% 2	450
	11th to 20th	Day	17% 15% 32% 23% 11% 2	524
	21st to end	Day	16% 13% 38% 23% 7% 3	630
July	1st to 10th	Day	11% 9% 33% 28% 15% 4	580
	11th to 20th	Day	12% 9% 33% 27% 13% 7%	444
	21st to end	Day	11% 8% 38% 26% 12% 4	488
August	1st to 10th	Day	9% 8% 29% 31% 15% 9%	446
	11th to 20th	Day	10% 7% 30% 27% 18% 8%	439
	21st to end	Day	15% 12% 31% 23% 15% 6%	495
September	1st to 10th	Day	14% 11% 31% 25% 13% 8%	450
	11th to 20th	Day	10% 12% 27% 23% 18% 10%	450
	21st to end	Day	15% 17% 28% 22% 13% 5%	450
October	1st to 10th	Day	24% 17% 23% 20% 11% 4	450
	11th to 20th	Day	24% 23% 34% 14% 5% 1	450
	21st to end	Day	32% 23% 28% 13% 3	495
November	1st to 10th	Day	26% 25% 28% 19% 2 1	243
	11th to 20th	Day	29% 22% 31% 12% 6% 1	180
	21st to end	Day	24% 26% 39% 9% 1	180
December	1st to 10th	Day	32% 27% 30% 11% 1	180
	11th to 20th	Day	29% 30% 29% 11% 1 1	180
	21st to end	Day	30% 32% 30% 6% 3	198
January	1st to 10th	Night	23% 29% 30% 14% 4	760
	11th to 20th	Night	26% 23% 31% 17% 3	760
	21st to end	Night	17% 22% 36% 20% 6%	836
February	1st to 10th	Night	22% 27% 34% 16% 1	760
	11th to 20th	Night	23% 24% 36% 13% 3	743
	21st to end	Night	21% 26% 35% 15% 2	628
March	1st to 10th	Night	21% 24% 35% 17% 3	760
	11th to 20th	Night	23% 23% 32% 16% 5%	760
	21st to end	Night	22% 19% 33% 19% 6%	836
April	1st to 10th	Night	25% 20% 34% 19% 2	729
	11th to 20th	Night	21% 19% 32% 18% 8% 1	632
	21st to end	Night	21% 15% 32% 24% 8%	540
May	1st to 10th	Night	19% 9% 31% 28% 11% 2	540
	11th to 20th	Night	17% 8% 35% 30% 9% 1	386
	21st to end	Night	10% 9% 36% 30% 14%	389
June	1st to 10th	Night	13% 9% 36% 32% 11%	360
	11th to 20th	Night	12% 10% 30% 34% 14%	360
	21st to end	Night	13% 6% 31% 34% 14%	360
July	1st to 10th	Night	7% 4 28% 41% 19% 2	350
	11th to 20th	Night	9% 8% 29% 33% 19% 1	348
	21st to end	Night	8% 5% 32% 38% 16% 1	580
August	1st to 10th	Night	10% 3 26% 37% 23% 2	537
	11th to 20th	Night	6% 5% 24% 40% 22% 3	534
	21st to end	Night	14% 5% 30% 28% 21% 2	652
September	1st to 10th	Night	10% 9% 29% 28% 18% 5%	720
	11th to 20th	Night	13% 8% 25% 29% 20% 5%	720
	21st to end	Night	18% 11% 24% 28% 16% 4	720
October	1st to 10th	Night	20% 12% 31% 21% 14% 2	720
	11th to 20th	Night	25% 17% 32% 19% 7% 1	720
	21st to end	Night	27% 20% 30% 19% 4	792
November	1st to 10th	Night	22% 18% 30% 21% 8% 1	740
	11th to 20th	Night	21% 25% 29% 19% 5% 1	760
	21st to end	Night	24% 22% 31% 19% 4	760
December	1st to 10th	Night	29% 24% 31% 13% 3	760
	11th to 20th	Night	22% 27% 33% 15% 3	760
	21st to end	Night	32% 21% 31% 14% 2	836

Page generated at 2024-03-31 06:08:54. Version ac07

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