Dinosaur Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dinosaur Provincial Park clear sky chart from 2005-11-06 to 2024-10-25.

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	8% 8% 3 7% 5% 5% 5% 4 6% 8% 41%	101805
	Night	7% 8% 3 9% 6% 5% 5% 4 6% 8% 38%	97102
Transparency	Day	39% 6% 15% 26% 11% 2	101546
	Night	41% 7% 15% 24% 11% 2	97007
Seeing	Day	11% 7% 25% 31% 20% 6%	15488
	Night	11% 7% 29% 36% 15% 2	24595

By Month

Percentage Cloud Cover NW (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	4 11% 5% 13% 7% 6% 7% 5% 7% 10% 26%	2219
	11th to 20th	Day	5% 8% 3 10% 9% 6% 10% 9% 8% 7% 27%	2199
	21st to end	Day	4 10% 4 9% 5% 5% 6% 5% 7% 8% 38%	2670
February	1st to 10th	Day	8% 14% 5% 12% 6% 5% 6% 5% 6% 8% 25%	1629
	11th to 20th	Day	7% 14% 5% 12% 7% 5% 6% 7% 8% 7% 23%	1665
	21st to end	Day	4 15% 4 12% 8% 6% 7% 4 5% 8% 27%	1425
March	1st to 10th	Day	4 10% 4 12% 8% 7% 5% 4 6% 7% 33%	3248
	11th to 20th	Day	7% 10% 3 7% 4 4 5% 4 5% 9% 42%	3489
	21st to end	Day	9% 14% 5% 12% 7% 6% 5% 4 6% 8% 25%	3825
April	1st to 10th	Day	8% 11% 3 10% 6% 6% 6% 4 6% 8% 33%	2329
	11th to 20th	Day	9% 11% 4 8% 5% 5% 5% 5% 6% 8% 33%	2440
	21st to end	Day	10% 8% 3 8% 6% 5% 5% 5% 7% 9% 33%	2470
May	1st to 10th	Day	18% 12% 3 7% 5% 4 4 4 6% 6% 31%	4355
	11th to 20th	Day	8% 7% 3 8% 5% 5% 6% 5% 8% 10% 35%	4620
	21st to end	Day	13% 9% 3 8% 6% 6% 6% 4 7% 8% 30%	5161
June	1st to 10th	Day	13% 7% 2 6% 5% 5% 5% 5% 7% 8% 37%	2850
	11th to 20th	Day	16% 7% 2 7% 5% 5% 5% 4 7% 9% 32%	2850
	21st to end	Day	8% 3 1 5% 4 4 4 5% 7% 10% 47%	2850
July	1st to 10th	Day	5% 4 2 5% 4 4 5% 4 6% 9% 52%	4740
	11th to 20th	Day	5% 4 2 5% 3 3 4 4 6% 8% 56%	4740
	21st to end	Day	3 2 1 2 2 2 3 3 5% 8% 69%	5138
August	1st to 10th	Day	5% 5% 2 5% 4 4 4 4 6% 8% 53%	4330
	11th to 20th	Day	5% 3 2 4 3 4 4 4 7% 10% 53%	4028
	21st to end	Day	7% 3 1 3 2 3 3 3 6% 8% 59%	4521
September	1st to 10th	Day	10% 6% 2 5% 3 3 4 3 5% 7% 53%	2366
	11th to 20th	Day	14% 6% 2 6% 4 4 3 2 5% 8% 46%	2109
	21st to end	Day	8% 7% 2 5% 4 3 4 4 6% 8% 50%	2090
October	1st to 10th	Day	10% 8% 3 8% 4 4 4 4 5% 6% 44%	1926
	11th to 20th	Day	8% 6% 3 6% 5% 6% 5% 4 6% 7% 44%	1876
	21st to end	Day	9% 9% 3 8% 4 4 5% 5% 7% 9% 38%	1796
November	1st to 10th	Day	12% 14% 5% 10% 6% 6% 4 4 6% 6% 28%	1488
	11th to 20th	Day	6% 12% 4 10% 7% 6% 6% 4 6% 6% 35%	1520
	21st to end	Day	6% 11% 5% 9% 6% 6% 5% 4 6% 10% 34%	1389
December	1st to 10th	Day	7% 11% 5% 11% 8% 7% 7% 6% 6% 6% 26%	1330
	11th to 20th	Day	4 13% 4 11% 7% 6% 6% 4 6% 8% 30%	1682
	21st to end	Day	4 9% 3 8% 5% 5% 5% 4 5% 6% 46%	2442
January	1st to 10th	Night	4 11% 4 12% 8% 7% 6% 5% 8% 9% 26%	4726
	11th to 20th	Night	5% 8% 4 13% 7% 6% 7% 5% 7% 8% 31%	4699
	21st to end	Night	4 9% 4 10% 6% 5% 5% 4 6% 7% 38%	5015
February	1st to 10th	Night	7% 11% 4 10% 6% 6% 6% 5% 6% 7% 31%	2550
	11th to 20th	Night	7% 12% 4 11% 7% 6% 7% 5% 7% 7% 28%	2402
	21st to end	Night	4 10% 3 10% 6% 6% 6% 5% 8% 9% 32%	2027
March	1st to 10th	Night	4 10% 4 13% 7% 6% 5% 5% 7% 7% 33%	3626
	11th to 20th	Night	9% 7% 2 8% 4 5% 5% 4 8% 9% 40%	3490
	21st to end	Night	7% 16% 6% 14% 7% 7% 6% 5% 6% 7% 19%	3828
April	1st to 10th	Night	9% 11% 4 9% 6% 6% 6% 5% 6% 8% 31%	1849
	11th to 20th	Night	9% 11% 3 10% 7% 5% 5% 4 6% 8% 33%	1691
	21st to end	Night	10% 9% 3 6% 5% 4 6% 5% 7% 9% 37%	1710
May	1st to 10th	Night	21% 10% 4 8% 5% 4 4 4 4 6% 30%	2614
	11th to 20th	Night	7% 4 3 7% 5% 6% 7% 6% 10% 11% 35%	2273
	21st to end	Night	12% 8% 3 9% 7% 7% 6% 5% 7% 7% 28%	2414
June	1st to 10th	Night	15% 8% 2 6% 4 5% 5% 5% 9% 9% 33%	1330
	11th to 20th	Night	15% 6% 4 5% 5% 5% 6% 6% 8% 8% 32%	1330
	21st to end	Night	7% 4 3 5% 5% 5% 5% 4 6% 8% 49%	1330
July	1st to 10th	Night	4 5% 2 5% 4 5% 5% 5% 8% 9% 49%	2220
	11th to 20th	Night	5% 3 2 4 4 4 5% 4 6% 11% 51%	2220
	21st to end	Night	2 3 2 4 4 3 3 3 6% 9% 61%	2414
August	1st to 10th	Night	7% 4 2 6% 4 5% 5% 4 7% 9% 48%	2601
	11th to 20th	Night	4 4 2 6% 5% 5% 4 5% 8% 10% 46%	2811
	21st to end	Night	9% 3 1 3 2 3 4 3 5% 9% 59%	3146
September	1st to 10th	Night	9% 5% 2 5% 5% 4 5% 3 5% 8% 48%	1813
	11th to 20th	Night	12% 5% 2 5% 4 4 3 3 5% 7% 50%	2067
	21st to end	Night	7% 5% 2 6% 5% 3 4 4 6% 8% 50%	2090
October	1st to 10th	Night	9% 8% 3 8% 4 4 4 4 5% 7% 45%	2253
	11th to 20th	Night	7% 6% 3 8% 5% 4 5% 4 7% 8% 43%	2304
	21st to end	Night	7% 9% 4 9% 6% 5% 5% 4 6% 8% 38%	2647
November	1st to 10th	Night	10% 12% 3 8% 6% 5% 5% 4 6% 7% 33%	2590
	11th to 20th	Night	5% 10% 2 9% 7% 6% 6% 4 7% 9% 36%	2660
	21st to end	Night	6% 11% 4 9% 6% 5% 5% 5% 7% 9% 33%	2788
December	1st to 10th	Night	7% 12% 5% 11% 7% 6% 5% 4 6% 6% 31%	2850
	11th to 20th	Night	4 10% 5% 11% 6% 7% 5% 4 6% 10% 33%	3510
	21st to end	Night	4 8% 3 8% 5% 5% 5% 4 5% 7% 46%	5214

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	50% 8% 15% 19% 7% 1	2219
	11th to 20th	Day	51% 9% 13% 13% 14% 1	2220
	21st to end	Day	40% 9% 22% 24% 5%	2670
February	1st to 10th	Day	56% 6% 13% 18% 7%	1629
	11th to 20th	Day	53% 8% 14% 17% 8%	1674
	21st to end	Day	54% 7% 11% 18% 9%	1425
March	1st to 10th	Day	49% 6% 13% 20% 11%	3248
	11th to 20th	Day	38% 7% 21% 23% 11%	3490
	21st to end	Day	54% 9% 15% 17% 5%	3825
April	1st to 10th	Day	47% 7% 15% 21% 9%	2329
	11th to 20th	Day	47% 6% 12% 27% 7% 1	2440
	21st to end	Day	45% 7% 14% 24% 8% 1	2470
May	1st to 10th	Day	52% 6% 11% 25% 6%	4355
	11th to 20th	Day	39% 8% 14% 26% 12%	4624
	21st to end	Day	48% 9% 12% 24% 6% 1	5162
June	1st to 10th	Day	43% 6% 15% 23% 11% 2	2850
	11th to 20th	Day	46% 8% 13% 23% 8% 2	2850
	21st to end	Day	29% 7% 21% 31% 9% 2	2850
July	1st to 10th	Day	27% 5% 18% 28% 17% 4	4666
	11th to 20th	Day	25% 4 17% 32% 18% 2	4659
	21st to end	Day	15% 3 11% 32% 26% 12%	4976
August	1st to 10th	Day	29% 4 13% 36% 15% 2	4312
	11th to 20th	Day	26% 5% 19% 39% 10% 1	4067
	21st to end	Day	24% 4 18% 38% 15% 2	4520
September	1st to 10th	Day	32% 4 14% 27% 16% 7%	2366
	11th to 20th	Day	38% 5% 14% 29% 12% 2	2109
	21st to end	Day	31% 5% 15% 31% 14% 3	2090
October	1st to 10th	Day	40% 5% 16% 27% 11% 1	1926
	11th to 20th	Day	38% 6% 16% 28% 11% 1	1876
	21st to end	Day	41% 7% 16% 25% 10% 1	1796
November	1st to 10th	Day	54% 6% 12% 20% 7% 1	1488
	11th to 20th	Day	46% 7% 17% 23% 7%	1520
	21st to end	Day	45% 7% 18% 22% 7% 1	1389
December	1st to 10th	Day	53% 9% 14% 16% 6% 2	1330
	11th to 20th	Day	51% 7% 16% 21% 5% 1	1684
	21st to end	Day	37% 5% 14% 27% 15% 2	2442
January	1st to 10th	Night	50% 9% 17% 19% 4 1	4726
	11th to 20th	Night	49% 6% 13% 18% 13% 2	4740
	21st to end	Night	43% 8% 16% 26% 7% 1	5015
February	1st to 10th	Night	49% 7% 13% 20% 11% 1	2550
	11th to 20th	Night	52% 7% 12% 18% 10% 1	2403
	21st to end	Night	44% 8% 13% 23% 11% 1	2027
March	1st to 10th	Night	47% 7% 15% 24% 7%	3626
	11th to 20th	Night	37% 8% 19% 27% 9% 1	3490
	21st to end	Night	57% 11% 13% 14% 4	3828
April	1st to 10th	Night	48% 7% 13% 21% 11% 1	1849
	11th to 20th	Night	48% 6% 12% 22% 12% 1	1691
	21st to end	Night	42% 6% 13% 26% 12% 2	1710
May	1st to 10th	Night	54% 6% 9% 21% 9%	2614
	11th to 20th	Night	35% 9% 15% 27% 12% 1	2273
	21st to end	Night	47% 11% 14% 21% 7% 1	2414
June	1st to 10th	Night	44% 6% 17% 22% 11% 1	1330
	11th to 20th	Night	44% 8% 14% 21% 11% 1	1330
	21st to end	Night	31% 6% 17% 31% 13% 1	1330
July	1st to 10th	Night	29% 5% 19% 24% 20% 2	2185
	11th to 20th	Night	27% 5% 15% 36% 15% 3	2178
	21st to end	Night	20% 4 8% 35% 23% 10%	2337
August	1st to 10th	Night	32% 5% 15% 30% 17% 2	2594
	11th to 20th	Night	31% 5% 16% 35% 12% 2	2838
	21st to end	Night	24% 4 14% 37% 19% 3	3146
September	1st to 10th	Night	33% 5% 12% 24% 18% 7%	1813
	11th to 20th	Night	34% 5% 14% 29% 14% 4	2067
	21st to end	Night	30% 6% 14% 31% 17% 2	2090
October	1st to 10th	Night	38% 5% 15% 26% 14% 2	2253
	11th to 20th	Night	36% 5% 15% 29% 13% 2	2304
	21st to end	Night	43% 7% 14% 26% 9% 1	2647
November	1st to 10th	Night	48% 7% 14% 21% 9% 1	2590
	11th to 20th	Night	43% 8% 18% 21% 10% 1	2660
	21st to end	Night	45% 7% 20% 20% 7% 1	2788
December	1st to 10th	Night	51% 6% 15% 19% 8% 1	2850
	11th to 20th	Night	45% 8% 23% 18% 5%	3507
	21st to end	Night	36% 6% 13% 24% 17% 3	5214

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	8% 9% 27% 28% 18% 9%	180
	11th to 20th	Day	12% 5% 28% 34% 18% 3	180
	21st to end	Day	5% 9% 29% 36% 17% 5%	198
February	1st to 10th	Day	18% 9% 29% 32% 11% 2	231
	11th to 20th	Day	13% 6% 23% 38% 18% 3	270
	21st to end	Day	8% 7% 24% 33% 23% 5%	237
March	1st to 10th	Day	10% 9% 32% 29% 14% 5%	460
	11th to 20th	Day	10% 7% 30% 33% 15% 5%	460
	21st to end	Day	11% 9% 30% 27% 18% 5%	506
April	1st to 10th	Day	10% 13% 30% 31% 13% 3	460
	11th to 20th	Day	10% 11% 31% 31% 14% 2	452
	21st to end	Day	12% 11% 26% 34% 13% 4	460
May	1st to 10th	Day	15% 8% 20% 29% 20% 7%	604
	11th to 20th	Day	12% 6% 21% 34% 21% 6%	675
	21st to end	Day	17% 6% 19% 28% 23% 7%	734
June	1st to 10th	Day	13% 10% 21% 33% 20% 3	680
	11th to 20th	Day	17% 8% 29% 27% 15% 3	680
	21st to end	Day	10% 5% 23% 33% 22% 8%	680
July	1st to 10th	Day	7% 5% 17% 36% 26% 9%	671
	11th to 20th	Day	10% 4 23% 31% 26% 6%	668
	21st to end	Day	5% 3 21% 32% 30% 9%	739
August	1st to 10th	Day	6% 5% 20% 36% 24% 9%	535
	11th to 20th	Day	8% 3 17% 33% 29% 10%	477
	21st to end	Day	8% 7% 22% 29% 24% 11%	539
September	1st to 10th	Day	12% 7% 23% 29% 24% 6%	490
	11th to 20th	Day	16% 6% 22% 29% 22% 5%	490
	21st to end	Day	12% 11% 32% 26% 16% 4	490
October	1st to 10th	Day	16% 5% 24% 29% 19% 7%	326
	11th to 20th	Day	9% 7% 34% 25% 23% 2	300
	21st to end	Day	15% 12% 27% 29% 14% 1	311
November	1st to 10th	Day	20% 10% 25% 29% 14% 1	270
	11th to 20th	Day	11% 13% 36% 27% 11% 2	270
	21st to end	Day	6% 8% 39% 29% 12% 7%	207
December	1st to 10th	Day	11% 4 34% 29% 18% 3	180
	11th to 20th	Day	8% 12% 39% 28% 11% 2	180
	21st to end	Day	10% 9% 23% 34% 20% 6%	198
January	1st to 10th	Night	8% 10% 34% 33% 13% 2	950
	11th to 20th	Night	12% 9% 29% 35% 13% 2	950
	21st to end	Night	11% 8% 30% 34% 14% 2	924
February	1st to 10th	Night	12% 8% 23% 36% 18% 3	760
	11th to 20th	Night	13% 7% 29% 39% 12% 1	744
	21st to end	Night	9% 5% 24% 36% 22% 4	628
March	1st to 10th	Night	8% 7% 32% 36% 14% 3	760
	11th to 20th	Night	10% 8% 31% 34% 14% 3	760
	21st to end	Night	13% 8% 25% 36% 16% 2	836
April	1st to 10th	Night	13% 10% 30% 30% 13% 3	623
	11th to 20th	Night	13% 8% 31% 36% 11% 1	563
	21st to end	Night	14% 8% 25% 37% 14% 1	570
May	1st to 10th	Night	16% 7% 23% 32% 19% 2	570
	11th to 20th	Night	9% 6% 29% 37% 18% 1	422
	21st to end	Night	21% 5% 21% 31% 20% 2	411
June	1st to 10th	Night	18% 8% 24% 31% 17% 2	380
	11th to 20th	Night	17% 6% 28% 32% 16% 1	380
	21st to end	Night	9% 6% 24% 36% 22% 3	380
July	1st to 10th	Night	8% 4 21% 46% 21% 1	370
	11th to 20th	Night	8% 4 25% 42% 19% 1	368
	21st to end	Night	4 5% 21% 43% 24% 3	416
August	1st to 10th	Night	8% 3 23% 40% 24% 2	462
	11th to 20th	Night	9% 4 21% 41% 24% 1	564
	21st to end	Night	12% 4 22% 37% 23% 2	627
September	1st to 10th	Night	12% 4 22% 45% 16% 2	570
	11th to 20th	Night	14% 4 22% 41% 17% 1	737
	21st to end	Night	11% 6% 30% 35% 16% 2	760
October	1st to 10th	Night	13% 5% 28% 39% 13% 2	760
	11th to 20th	Night	9% 8% 31% 35% 15% 2	760
	21st to end	Night	12% 9% 31% 35% 11%	820
November	1st to 10th	Night	17% 8% 33% 31% 9% 1	925
	11th to 20th	Night	10% 11% 38% 29% 11% 2	950
	21st to end	Night	10% 8% 33% 35% 12% 1	950
December	1st to 10th	Night	12% 7% 29% 34% 14% 3	950
	11th to 20th	Night	9% 8% 35% 34% 13% 2	950
	21st to end	Night	11% 6% 33% 35% 14% 2	1045

Page generated at 2024-10-22 18:21:05. Version ac07

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