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 2024-11-04.

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	14% 11% 4 9% 6% 5% 5% 4 6% 7% 31%	101951
	Night	14% 11% 4 9% 5% 5% 5% 4 5% 6% 33%	97051
Transparency	Day	50% 7% 12% 20% 10% 1	105554
	Night	48% 8% 12% 20% 11% 1	101537
Seeing	Day	21% 18% 31% 18% 8% 3	14817
	Night	20% 17% 31% 23% 9% 1	23806

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% 12% 7% 5% 4 4 5% 4 22%	2517
	11th to 20th	Day	10% 20% 7% 18% 10% 7% 4 3 4 5% 12%	2780
	21st to end	Day	20% 21% 7% 12% 5% 4 4 3 3 5% 15%	3124
February	1st to 10th	Day	13% 18% 4 13% 9% 7% 6% 5% 4 4 18%	1710
	11th to 20th	Day	11% 15% 7% 15% 8% 5% 4 3 6% 6% 21%	1663
	21st to end	Day	16% 18% 5% 11% 5% 5% 5% 3 5% 5% 23%	1470
March	1st to 10th	Day	16% 14% 6% 10% 6% 4 4 3 4 5% 28%	3430
	11th to 20th	Day	10% 17% 6% 11% 7% 5% 5% 3 4 5% 28%	3480
	21st to end	Day	14% 12% 4 8% 5% 5% 4 3 5% 5% 35%	3815
April	1st to 10th	Day	15% 16% 4 9% 5% 4 4 3 6% 6% 28%	2228
	11th to 20th	Day	18% 11% 3 7% 4 3 4 3 4 7% 35%	2356
	21st to end	Day	20% 11% 4 8% 4 3 3 3 5% 6% 33%	2470
May	1st to 10th	Day	16% 9% 4 7% 4 4 4 4 5% 8% 35%	4108
	11th to 20th	Day	16% 10% 3 8% 5% 5% 5% 4 6% 7% 31%	4352
	21st to end	Day	12% 5% 2 6% 4 5% 4 4 6% 8% 45%	4837
June	1st to 10th	Day	15% 7% 3 5% 5% 5% 5% 4 6% 9% 36%	2660
	11th to 20th	Day	12% 6% 2 6% 4 4 5% 4 7% 9% 40%	2739
	21st to end	Day	14% 6% 2 6% 5% 4 5% 4 7% 8% 38%	2850
July	1st to 10th	Day	11% 5% 2 7% 6% 5% 5% 5% 7% 10% 37%	4675
	11th to 20th	Day	10% 6% 2 5% 5% 5% 5% 5% 7% 9% 42%	4440
	21st to end	Day	9% 6% 2 7% 5% 5% 6% 5% 7% 8% 40%	4474
August	1st to 10th	Day	14% 8% 2 7% 5% 5% 5% 4 7% 8% 35%	4104
	11th to 20th	Day	11% 8% 3 8% 6% 5% 6% 4 8% 9% 32%	4044
	21st to end	Day	10% 7% 2 6% 4 5% 5% 4 7% 8% 41%	4386
September	1st to 10th	Day	13% 8% 3 7% 5% 5% 5% 3 4 8% 39%	2280
	11th to 20th	Day	11% 6% 2 7% 5% 5% 4 4 5% 9% 43%	2142
	21st to end	Day	15% 7% 3 8% 7% 5% 5% 4 6% 8% 33%	2066
October	1st to 10th	Day	19% 9% 3 8% 4 5% 4 3 5% 6% 32%	1900
	11th to 20th	Day	19% 11% 4 9% 6% 4 5% 4 4 6% 28%	1900
	21st to end	Day	25% 16% 4 8% 5% 4 3 4 4 6% 21%	2090
November	1st to 10th	Day	12% 14% 4 9% 5% 5% 5% 4 6% 8% 28%	1623
	11th to 20th	Day	12% 14% 5% 11% 7% 5% 5% 4 6% 7% 23%	1520
	21st to end	Day	16% 18% 7% 10% 7% 5% 5% 5% 5% 6% 17%	1520
December	1st to 10th	Day	14% 20% 7% 13% 8% 7% 5% 3 4 6% 13%	1520
	11th to 20th	Day	16% 18% 6% 13% 6% 5% 5% 3 5% 6% 17%	1906
	21st to end	Day	25% 19% 8% 16% 5% 4 4 3 4 3 9%	2772
January	1st to 10th	Night	15% 16% 7% 13% 7% 6% 5% 3 4 5% 19%	4429
	11th to 20th	Night	12% 14% 7% 15% 11% 9% 6% 4 4 5% 12%	4176
	21st to end	Night	18% 13% 7% 12% 10% 6% 5% 4 5% 5% 15%	4532
February	1st to 10th	Night	13% 15% 5% 11% 9% 5% 4 4 5% 6% 23%	2470
	11th to 20th	Night	11% 14% 5% 12% 7% 7% 6% 3 5% 6% 24%	2403
	21st to end	Night	11% 13% 5% 11% 7% 6% 5% 4 6% 6% 27%	1982
March	1st to 10th	Night	16% 11% 5% 9% 6% 5% 4 4 5% 6% 29%	3408
	11th to 20th	Night	11% 11% 5% 9% 5% 4 5% 4 5% 7% 35%	3479
	21st to end	Night	14% 8% 3 6% 5% 4 5% 4 5% 5% 41%	3817
April	1st to 10th	Night	17% 13% 3 8% 5% 5% 4 3 4 6% 31%	1951
	11th to 20th	Night	17% 9% 2 5% 5% 4 5% 4 5% 7% 38%	1791
	21st to end	Night	14% 12% 3 7% 4 4 4 4 6% 6% 35%	1710
May	1st to 10th	Night	16% 8% 2 7% 4 4 4 3 5% 6% 40%	2833
	11th to 20th	Night	16% 7% 3 6% 4 4 4 4 5% 8% 39%	2541
	21st to end	Night	9% 5% 2 5% 4 3 4 3 6% 8% 52%	2738
June	1st to 10th	Night	13% 6% 2 5% 4 6% 4 4 6% 9% 41%	1520
	11th to 20th	Night	9% 4 2 7% 4 5% 5% 5% 7% 9% 43%	1434
	21st to end	Night	12% 5% 2 6% 3 4 4 4 5% 8% 47%	1330
July	1st to 10th	Night	5% 5% 2 6% 4 4 5% 4 6% 7% 51%	2272
	11th to 20th	Night	11% 4 2 4 4 3 4 3 5% 7% 53%	2520
	21st to end	Night	6% 6% 2 5% 4 4 5% 4 7% 7% 51%	3076
August	1st to 10th	Night	10% 6% 3 6% 3 4 4 3 6% 7% 49%	2825
	11th to 20th	Night	11% 7% 2 5% 3 3 4 4 5% 8% 48%	2785
	21st to end	Night	11% 6% 2 5% 4 3 5% 3 6% 7% 48%	3238
September	1st to 10th	Night	9% 5% 2 6% 4 4 4 4 7% 6% 49%	1900
	11th to 20th	Night	11% 4 2 4 3 3 3 4 5% 7% 54%	2033
	21st to end	Night	15% 7% 3 6% 5% 4 4 3 5% 7% 41%	2114
October	1st to 10th	Night	17% 6% 3 8% 5% 5% 4 3 6% 7% 38%	2280
	11th to 20th	Night	17% 10% 3 7% 5% 5% 4 4 6% 5% 34%	2280
	21st to end	Night	20% 12% 3 9% 5% 5% 5% 5% 5% 6% 26%	2508
November	1st to 10th	Night	15% 10% 3 7% 5% 5% 5% 4 6% 6% 35%	2524
	11th to 20th	Night	15% 13% 3 10% 6% 5% 5% 4 6% 7% 27%	2660
	21st to end	Night	16% 15% 5% 10% 6% 5% 5% 4 5% 7% 22%	2660
December	1st to 10th	Night	19% 15% 5% 10% 7% 6% 5% 4 6% 6% 18%	2660
	11th to 20th	Night	14% 18% 6% 13% 7% 5% 5% 4 5% 6% 18%	3288
	21st to end	Night	25% 19% 7% 15% 5% 5% 4 3 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	58% 6% 11% 15% 9%	3433
	11th to 20th	Day	56% 8% 9% 19% 8% 1	3480
	21st to end	Day	49% 7% 10% 18% 13% 2	3815
April	1st to 10th	Day	56% 6% 10% 17% 10% 1	2228
	11th to 20th	Day	49% 5% 9% 21% 15% 1	2356
	21st to end	Day	52% 5% 11% 18% 12% 2	2470
May	1st to 10th	Day	46% 7% 12% 20% 14% 1	4120
	11th to 20th	Day	49% 10% 12% 20% 8% 1	4356
	21st to end	Day	36% 7% 14% 22% 18% 3	4837
June	1st to 10th	Day	43% 8% 12% 21% 15% 1	2660
	11th to 20th	Day	38% 7% 14% 24% 16% 1	2739
	21st to end	Day	41% 7% 14% 24% 14% 1	2850
July	1st to 10th	Day	40% 8% 15% 21% 15% 1	4603
	11th to 20th	Day	34% 8% 12% 34% 11% 1	4365
	21st to end	Day	38% 9% 13% 23% 17% 1	4331
August	1st to 10th	Day	44% 7% 14% 23% 11% 1	4091
	11th to 20th	Day	44% 7% 16% 23% 9%	4083
	21st to end	Day	38% 7% 15% 30% 10% 1	4386
September	1st to 10th	Day	43% 7% 13% 25% 10% 2	2280
	11th to 20th	Day	38% 6% 13% 29% 14%	2142
	21st to end	Day	48% 6% 13% 23% 8%	2066
October	1st to 10th	Day	43% 8% 13% 25% 11% 1	3160
	11th to 20th	Day	43% 7% 14% 21% 14%	3140
	21st to end	Day	58% 6% 13% 17% 6%	3428
November	1st to 10th	Day	51% 9% 13% 18% 8%	1623
	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	53% 7% 12% 20% 7% 1	3418
	11th to 20th	Night	44% 8% 15% 21% 10% 2	3480
	21st to end	Night	42% 7% 10% 23% 16% 2	3817
April	1st to 10th	Night	54% 4 10% 18% 12% 1	1951
	11th to 20th	Night	46% 6% 10% 21% 16% 2	1791
	21st to end	Night	48% 6% 12% 17% 15% 2	1710
May	1st to 10th	Night	43% 6% 12% 18% 16% 3	2840
	11th to 20th	Night	43% 7% 13% 24% 11% 2	2542
	21st to end	Night	29% 8% 13% 25% 21% 2	2739
June	1st to 10th	Night	39% 7% 12% 23% 18% 2	1520
	11th to 20th	Night	35% 8% 13% 24% 19% 1	1434
	21st to end	Night	35% 8% 13% 28% 16% 1	1330
July	1st to 10th	Night	29% 7% 15% 25% 20% 3	2235
	11th to 20th	Night	30% 5% 12% 35% 17% 1	2472
	21st to end	Night	30% 9% 14% 30% 15% 2	2978
August	1st to 10th	Night	35% 5% 13% 30% 15% 2	2814
	11th to 20th	Night	34% 6% 16% 30% 13% 1	2812
	21st to end	Night	33% 7% 14% 32% 13% 1	3238
September	1st to 10th	Night	32% 8% 15% 29% 14% 1	1900
	11th to 20th	Night	29% 6% 12% 34% 18%	2033
	21st to end	Night	44% 6% 13% 27% 10% 1	2114
October	1st to 10th	Night	34% 7% 9% 27% 21% 1	3800
	11th to 20th	Night	43% 7% 12% 24% 14% 1	3779
	21st to end	Night	45% 8% 15% 23% 8%	4120
November	1st to 10th	Night	47% 8% 12% 22% 10% 1	2524
	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	26% 25% 32% 11% 5%	460
	11th to 20th	Day	34% 21% 24% 12% 7% 3	452
	21st to end	Day	28% 20% 32% 14% 5% 2	460
May	1st to 10th	Day	22% 17% 32% 18% 7% 2	463
	11th to 20th	Day	20% 16% 31% 20% 9% 3	487
	21st to end	Day	15% 17% 30% 25% 9% 4	529
June	1st to 10th	Day	17% 16% 35% 22% 8% 2	490
	11th to 20th	Day	16% 14% 33% 24% 10% 2	569
	21st to end	Day	16% 15% 37% 21% 7% 3	680
July	1st to 10th	Day	12% 10% 34% 27% 14% 3	627
	11th to 20th	Day	12% 10% 32% 27% 13% 6%	484
	21st to end	Day	11% 8% 38% 26% 12% 5%	532
August	1st to 10th	Day	11% 8% 29% 29% 15% 8%	486
	11th to 20th	Day	10% 9% 30% 25% 18% 8%	479
	21st to end	Day	15% 11% 31% 23% 15% 6%	539
September	1st to 10th	Day	14% 12% 30% 24% 13% 8%	490
	11th to 20th	Day	10% 11% 25% 23% 19% 12%	490
	21st to end	Day	16% 17% 27% 22% 13% 5%	490
October	1st to 10th	Day	24% 17% 25% 20% 10% 4	490
	11th to 20th	Day	23% 22% 34% 14% 6% 1	490
	21st to end	Day	32% 23% 29% 13% 3	539
November	1st to 10th	Day	26% 24% 28% 18% 3 1	253
	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% 20% 33% 19% 6%	836
April	1st to 10th	Night	25% 20% 34% 19% 2	760
	11th to 20th	Night	21% 19% 33% 18% 8% 1	667
	21st to end	Night	21% 16% 32% 24% 8%	570
May	1st to 10th	Night	18% 9% 31% 29% 11% 2	570
	11th to 20th	Night	17% 8% 34% 30% 10% 1	407
	21st to end	Night	10% 9% 36% 31% 14%	411
June	1st to 10th	Night	14% 9% 35% 31% 11%	380
	11th to 20th	Night	11% 10% 30% 35% 13%	380
	21st to end	Night	14% 7% 32% 33% 14%	380
July	1st to 10th	Night	7% 4 29% 41% 18% 2	370
	11th to 20th	Night	10% 8% 28% 33% 19% 1	368
	21st to end	Night	8% 5% 31% 38% 17% 1	613
August	1st to 10th	Night	10% 3 26% 37% 22% 2	567
	11th to 20th	Night	7% 5% 24% 39% 22% 2	564
	21st to end	Night	14% 5% 30% 28% 21% 2	689
September	1st to 10th	Night	11% 9% 29% 28% 18% 5%	760
	11th to 20th	Night	12% 8% 24% 28% 22% 5%	760
	21st to end	Night	19% 10% 23% 28% 16% 4	760
October	1st to 10th	Night	19% 12% 32% 21% 14% 2	760
	11th to 20th	Night	24% 17% 31% 20% 8% 1	760
	21st to end	Night	26% 21% 30% 19% 4	836
November	1st to 10th	Night	23% 18% 30% 21% 8% 1	755
	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 2024-11-01 22:47:34. Version ac07

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