Lloydminster
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lloydminster clear sky chart from 2005-11-06 to 2024-02-25.

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	10% 8% 4 8% 7% 4 6% 6% 6% 8% 33%	77605
	Night	8% 9% 4 8% 8% 4 6% 6% 6% 8% 33%	81602
Transparency	Day	47% 9% 17% 21% 7% 1	77306
	Night	47% 8% 15% 20% 8% 1	81481
Seeing	Day	13% 7% 27% 31% 17% 5%	14551
	Night	12% 6% 30% 35% 15% 2	23922

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	6% 11% 5% 15% 15% 5% 6% 5% 5% 5% 22%	2219
	11th to 20th	Day	6% 7% 3 8% 10% 6% 9% 11% 9% 8% 23%	2199
	21st to end	Day	6% 13% 6% 13% 7% 4 5% 5% 5% 6% 30%	2442
February	1st to 10th	Day	8% 12% 5% 13% 10% 4 7% 6% 7% 7% 22%	1588
	11th to 20th	Day	7% 12% 5% 12% 10% 6% 6% 5% 6% 6% 24%	1665
	21st to end	Day	5% 11% 7% 10% 8% 4 7% 7% 8% 8% 24%	1368
March	1st to 10th	Day	9% 13% 5% 10% 9% 6% 9% 7% 7% 7% 19%	1804
	11th to 20th	Day	8% 11% 6% 10% 6% 3 4 5% 7% 8% 32%	1979
	21st to end	Day	10% 12% 5% 12% 8% 4 4 5% 5% 6% 28%	2191
April	1st to 10th	Day	8% 11% 5% 8% 8% 4 5% 5% 5% 7% 35%	2227
	11th to 20th	Day	13% 8% 4 8% 7% 4 7% 5% 6% 8% 31%	2310
	21st to end	Day	16% 9% 3 6% 5% 3 5% 5% 6% 8% 33%	2418
May	1st to 10th	Day	9% 8% 4 9% 7% 4 6% 5% 7% 7% 33%	2520
	11th to 20th	Day	9% 6% 3 6% 6% 4 5% 6% 6% 7% 41%	2649
	21st to end	Day	16% 7% 3 6% 6% 4 6% 5% 6% 9% 33%	2917
June	1st to 10th	Day	15% 7% 4 7% 6% 3 6% 5% 7% 8% 31%	2772
	11th to 20th	Day	21% 8% 4 7% 7% 4 6% 6% 7% 7% 24%	2880
	21st to end	Day	12% 6% 3 6% 6% 3 6% 6% 8% 10% 35%	2826
July	1st to 10th	Day	10% 4 2 5% 6% 3 6% 6% 7% 11% 39%	2700
	11th to 20th	Day	10% 6% 2 6% 6% 4 6% 7% 7% 9% 36%	2700
	21st to end	Day	8% 4 2 4 5% 3 5% 5% 7% 9% 46%	2938
August	1st to 10th	Day	10% 5% 2 6% 6% 4 5% 6% 7% 8% 41%	2633
	11th to 20th	Day	10% 6% 2 5% 5% 4 5% 6% 6% 9% 43%	2328
	21st to end	Day	10% 7% 2 5% 5% 3 5% 5% 6% 9% 44%	2574
September	1st to 10th	Day	11% 6% 2 6% 5% 4 5% 6% 6% 9% 41%	2224
	11th to 20th	Day	15% 8% 3 6% 4 3 4 4 5% 7% 41%	2084
	21st to end	Day	10% 6% 3 5% 6% 3 4 5% 6% 9% 44%	1949
October	1st to 10th	Day	12% 11% 3 7% 6% 3 4 5% 6% 6% 37%	1800
	11th to 20th	Day	10% 8% 4 7% 6% 3 5% 4 5% 7% 39%	1787
	21st to end	Day	8% 11% 5% 10% 8% 4 5% 6% 5% 7% 31%	1643
November	1st to 10th	Day	14% 13% 7% 8% 9% 4 4 4 6% 7% 26%	1488
	11th to 20th	Day	8% 12% 7% 13% 10% 5% 6% 5% 6% 7% 23%	1520
	21st to end	Day	6% 10% 7% 13% 10% 4 4 4 7% 8% 26%	1330
December	1st to 10th	Day	8% 13% 6% 10% 8% 5% 7% 6% 7% 9% 23%	1169
	11th to 20th	Day	6% 11% 5% 12% 9% 5% 8% 6% 6% 8% 25%	1439
	21st to end	Day	4 8% 4 8% 6% 4 5% 6% 6% 8% 42%	2325
January	1st to 10th	Night	6% 10% 6% 14% 11% 5% 7% 6% 8% 7% 21%	4726
	11th to 20th	Night	4 7% 4 9% 10% 6% 9% 11% 8% 10% 22%	4699
	21st to end	Night	7% 12% 5% 9% 10% 4 6% 4 5% 7% 31%	5214
February	1st to 10th	Night	6% 10% 5% 11% 11% 5% 7% 6% 7% 8% 25%	2609
	11th to 20th	Night	6% 10% 4 9% 10% 5% 6% 5% 8% 7% 30%	2402
	21st to end	Night	3 9% 5% 10% 9% 6% 6% 5% 6% 8% 32%	1982
March	1st to 10th	Night	7% 11% 4 10% 8% 6% 6% 7% 7% 7% 26%	2151
	11th to 20th	Night	8% 10% 5% 8% 7% 3 6% 4 7% 8% 34%	1980
	21st to end	Night	8% 12% 7% 8% 8% 5% 7% 5% 5% 7% 28%	2165
April	1st to 10th	Night	6% 8% 4 7% 6% 4 6% 5% 7% 8% 39%	1730
	11th to 20th	Night	9% 8% 4 8% 8% 4 5% 7% 7% 9% 32%	1601
	21st to end	Night	14% 10% 4 7% 5% 2 5% 4 5% 8% 35%	1541
May	1st to 10th	Night	10% 7% 4 8% 7% 4 5% 5% 6% 8% 37%	1440
	11th to 20th	Night	10% 6% 3 5% 5% 4 5% 6% 6% 8% 42%	1240
	21st to end	Night	15% 7% 2 6% 7% 3 6% 6% 7% 8% 32%	1358
June	1st to 10th	Night	11% 7% 3 8% 6% 4 6% 5% 6% 10% 32%	1184
	11th to 20th	Night	20% 8% 4 7% 5% 4 5% 6% 6% 7% 28%	1080
	21st to end	Night	9% 6% 2 5% 6% 4 5% 6% 8% 9% 39%	1128
July	1st to 10th	Night	8% 3 2 5% 5% 3 6% 6% 6% 9% 47%	1260
	11th to 20th	Night	9% 4 3 4 5% 3 6% 5% 6% 9% 45%	1260
	21st to end	Night	7% 3 2 4 5% 3 4 5% 6% 10% 51%	1379
August	1st to 10th	Night	8% 4 1 5% 5% 4 4 7% 8% 11% 44%	1306
	11th to 20th	Night	10% 5% 3 5% 5% 3 5% 6% 7% 11% 41%	1572
	21st to end	Night	8% 5% 2 5% 5% 3 4 4 5% 8% 49%	1782
September	1st to 10th	Night	12% 5% 2 5% 5% 3 4 5% 6% 7% 47%	1736
	11th to 20th	Night	12% 5% 2 3 6% 3 5% 5% 5% 7% 47%	1876
	21st to end	Night	6% 5% 3 5% 5% 3 4 4 7% 9% 48%	2010
October	1st to 10th	Night	11% 9% 3 7% 5% 3 5% 5% 5% 8% 39%	2160
	11th to 20th	Night	8% 9% 5% 6% 6% 3 4 4 5% 8% 42%	2169
	21st to end	Night	8% 11% 5% 9% 6% 3 5% 5% 6% 7% 34%	2695
November	1st to 10th	Night	14% 14% 5% 8% 7% 4 5% 5% 5% 7% 26%	2590
	11th to 20th	Night	8% 11% 6% 12% 11% 5% 6% 4 6% 6% 25%	2660
	21st to end	Night	4 11% 7% 12% 9% 5% 6% 6% 5% 7% 29%	2845
December	1st to 10th	Night	7% 10% 5% 10% 9% 5% 7% 6% 6% 8% 25%	3007
	11th to 20th	Night	7% 11% 6% 13% 12% 6% 6% 6% 5% 7% 21%	3753
	21st to end	Night	3 6% 3 7% 8% 5% 6% 5% 5% 7% 44%	5312

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% 8% 11% 14% 5%	2219
	11th to 20th	Day	53% 10% 14% 18% 5% 1	2220
	21st to end	Day	54% 7% 13% 19% 7%	2442
February	1st to 10th	Day	60% 6% 13% 16% 6%	1588
	11th to 20th	Day	57% 7% 13% 15% 7% 1	1674
	21st to end	Day	54% 9% 13% 17% 7%	1368
March	1st to 10th	Day	61% 11% 13% 13% 3	1804
	11th to 20th	Day	49% 8% 16% 19% 7% 1	1980
	21st to end	Day	54% 9% 14% 17% 5%	2191
April	1st to 10th	Day	47% 8% 15% 21% 9%	2227
	11th to 20th	Day	49% 8% 14% 19% 8% 2	2310
	21st to end	Day	47% 8% 15% 21% 8% 1	2418
May	1st to 10th	Day	46% 9% 13% 21% 10%	2520
	11th to 20th	Day	39% 7% 15% 27% 11% 1	2653
	21st to end	Day	46% 9% 15% 21% 9%	2918
June	1st to 10th	Day	46% 11% 17% 19% 7%	2772
	11th to 20th	Day	55% 11% 13% 15% 4 1	2880
	21st to end	Day	42% 11% 21% 21% 5%	2826
July	1st to 10th	Day	36% 11% 23% 24% 5% 1	2626
	11th to 20th	Day	38% 14% 24% 21% 2	2619
	21st to end	Day	32% 11% 26% 26% 4	2775
August	1st to 10th	Day	37% 12% 23% 25% 4	2615
	11th to 20th	Day	36% 11% 26% 22% 5%	2328
	21st to end	Day	35% 9% 20% 29% 5% 1	2574
September	1st to 10th	Day	38% 10% 18% 24% 7% 2	2224
	11th to 20th	Day	43% 7% 18% 26% 6%	2084
	21st to end	Day	36% 9% 17% 28% 9% 2	1949
October	1st to 10th	Day	47% 7% 17% 23% 6%	1800
	11th to 20th	Day	43% 7% 16% 26% 8%	1787
	21st to end	Day	51% 9% 16% 17% 8%	1643
November	1st to 10th	Day	57% 7% 13% 16% 6%	1488
	11th to 20th	Day	60% 10% 15% 12% 4	1520
	21st to end	Day	55% 9% 16% 16% 4	1330
December	1st to 10th	Day	57% 8% 11% 16% 6% 1	1169
	11th to 20th	Day	54% 11% 15% 15% 5%	1440
	21st to end	Day	40% 6% 13% 24% 15% 2	2325
January	1st to 10th	Night	58% 9% 15% 13% 5%	4726
	11th to 20th	Night	53% 8% 15% 17% 6% 1	4740
	21st to end	Night	52% 8% 13% 20% 6%	5214
February	1st to 10th	Night	54% 8% 13% 17% 8%	2609
	11th to 20th	Night	49% 7% 15% 18% 11%	2403
	21st to end	Night	47% 8% 14% 20% 11%	1982
March	1st to 10th	Night	53% 9% 16% 15% 6%	2151
	11th to 20th	Night	46% 7% 14% 22% 11% 1	1980
	21st to end	Night	52% 10% 13% 16% 9%	2165
April	1st to 10th	Night	40% 8% 15% 20% 16% 1	1730
	11th to 20th	Night	46% 8% 15% 18% 11% 2	1601
	21st to end	Night	46% 6% 13% 21% 11% 2	1541
May	1st to 10th	Night	42% 8% 13% 23% 13% 1	1440
	11th to 20th	Night	36% 7% 12% 27% 15% 2	1240
	21st to end	Night	46% 9% 14% 20% 9% 1	1358
June	1st to 10th	Night	46% 9% 15% 21% 8% 1	1184
	11th to 20th	Night	53% 11% 13% 16% 8%	1080
	21st to end	Night	35% 12% 25% 21% 5% 1	1128
July	1st to 10th	Night	31% 10% 24% 27% 7% 1	1225
	11th to 20th	Night	33% 11% 25% 26% 6%	1218
	21st to end	Night	26% 11% 25% 31% 6%	1302
August	1st to 10th	Night	29% 13% 27% 26% 5%	1299
	11th to 20th	Night	34% 9% 23% 27% 7%	1572
	21st to end	Night	33% 8% 16% 33% 10% 1	1782
September	1st to 10th	Night	35% 8% 18% 25% 9% 5%	1736
	11th to 20th	Night	36% 8% 17% 30% 8% 1	1876
	21st to end	Night	32% 6% 16% 31% 12% 2	2010
October	1st to 10th	Night	42% 8% 15% 25% 9% 1	2160
	11th to 20th	Night	40% 6% 15% 28% 11%	2169
	21st to end	Night	47% 8% 14% 22% 8% 1	2695
November	1st to 10th	Night	58% 7% 12% 16% 7% 1	2590
	11th to 20th	Night	58% 8% 14% 14% 5%	2660
	21st to end	Night	54% 9% 17% 17% 4	2845
December	1st to 10th	Night	55% 8% 14% 16% 6% 2	3007
	11th to 20th	Night	62% 8% 14% 11% 5%	3751
	21st to end	Night	38% 7% 14% 22% 17% 2	5312

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	11% 6% 28% 31% 22% 3	180
	11th to 20th	Day	13% 9% 25% 29% 21% 2	180
	21st to end	Day	13% 11% 30% 31% 11% 4	198
February	1st to 10th	Day	7% 10% 38% 27% 14% 3	222
	11th to 20th	Day	11% 9% 31% 27% 18% 4	270
	21st to end	Day	8% 4 27% 39% 16% 6%	210
March	1st to 10th	Day	9% 10% 30% 34% 14% 2	338
	11th to 20th	Day	10% 6% 33% 31% 16% 4	420
	21st to end	Day	13% 5% 29% 34% 16% 4	462
April	1st to 10th	Day	9% 10% 32% 34% 11% 4	420
	11th to 20th	Day	14% 6% 31% 31% 13% 5%	412
	21st to end	Day	18% 9% 30% 29% 11% 2	498
May	1st to 10th	Day	11% 10% 26% 33% 14% 6%	603
	11th to 20th	Day	10% 8% 25% 31% 18% 7%	625
	21st to end	Day	17% 6% 22% 31% 16% 7%	679
June	1st to 10th	Day	15% 7% 29% 32% 13% 4	630
	11th to 20th	Day	20% 9% 27% 24% 15% 5%	630
	21st to end	Day	12% 5% 22% 29% 22% 9%	630
July	1st to 10th	Day	12% 4 19% 32% 26% 5%	621
	11th to 20th	Day	11% 5% 26% 33% 18% 7%	618
	21st to end	Day	8% 4 22% 31% 26% 9%	684
August	1st to 10th	Day	12% 6% 18% 30% 27% 7%	626
	11th to 20th	Day	11% 7% 22% 31% 23% 8%	466
	21st to end	Day	14% 4 22% 29% 22% 8%	495
September	1st to 10th	Day	16% 8% 32% 25% 15% 4	450
	11th to 20th	Day	22% 8% 20% 34% 13% 3	450
	21st to end	Day	12% 13% 25% 32% 16% 2	419
October	1st to 10th	Day	14% 7% 27% 36% 13% 3	270
	11th to 20th	Day	17% 9% 31% 27% 12% 3	270
	21st to end	Day	13% 13% 33% 26% 13% 2	297
November	1st to 10th	Day	17% 10% 27% 29% 15% 2	270
	11th to 20th	Day	13% 9% 42% 24% 11% 1	270
	21st to end	Day	5% 14% 38% 32% 7% 4	180
December	1st to 10th	Day	7% 7% 31% 31% 19% 6%	180
	11th to 20th	Day	8% 9% 35% 33% 14% 1	180
	21st to end	Day	10% 6% 26% 33% 18% 7%	198
January	1st to 10th	Night	12% 7% 32% 35% 13% 1	950
	11th to 20th	Night	11% 6% 34% 37% 11% 1	950
	21st to end	Night	15% 9% 35% 31% 8% 2	1045
February	1st to 10th	Night	8% 8% 29% 37% 16% 2	797
	11th to 20th	Night	11% 6% 35% 31% 16% 2	744
	21st to end	Night	6% 4 24% 39% 22% 4	610
March	1st to 10th	Night	11% 4 32% 39% 12% 2	720
	11th to 20th	Night	11% 6% 31% 36% 15% 2	720
	21st to end	Night	13% 6% 27% 35% 16% 3	779
April	1st to 10th	Night	8% 6% 31% 36% 16% 3	540
	11th to 20th	Night	12% 6% 32% 34% 14% 2	533
	21st to end	Night	17% 7% 25% 35% 14% 1	540
May	1st to 10th	Night	11% 7% 29% 33% 18% 1	540
	11th to 20th	Night	12% 4 28% 35% 18% 3	355
	21st to end	Night	19% 3 18% 37% 20% 3	389
June	1st to 10th	Night	13% 8% 25% 36% 17% 2	360
	11th to 20th	Night	23% 7% 22% 28% 18% 3	360
	21st to end	Night	12% 2 19% 37% 28% 3	360
July	1st to 10th	Night	10% 2 19% 45% 23% 1	350
	11th to 20th	Night	11% 3 21% 42% 20% 1	348
	21st to end	Night	7% 5% 17% 42% 25% 5%	394
August	1st to 10th	Night	8% 3 19% 37% 28% 5%	411
	11th to 20th	Night	11% 4 21% 40% 22% 2	534
	21st to end	Night	10% 3 25% 38% 22% 1	594
September	1st to 10th	Night	15% 5% 20% 41% 17% 2	540
	11th to 20th	Night	14% 3 22% 43% 17%	616
	21st to end	Night	9% 6% 31% 37% 16% 1	720
October	1st to 10th	Night	15% 5% 29% 35% 14% 1	720
	11th to 20th	Night	12% 4 34% 33% 14% 2	720
	21st to end	Night	15% 8% 35% 31% 10%	913
November	1st to 10th	Night	20% 6% 32% 31% 9% 1	925
	11th to 20th	Night	14% 8% 32% 32% 12% 3	950
	21st to end	Night	9% 8% 38% 34% 9% 1	950
December	1st to 10th	Night	12% 6% 33% 31% 14% 4	950
	11th to 20th	Night	12% 9% 35% 31% 11% 2	950
	21st to end	Night	9% 5% 33% 33% 16% 4	1045

Page generated at 2024-02-22 04:05:43. Version ac07

Copyright 2024 Attilla Danko